MC-211096Entities in cobwebs clipping though pistons
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecraft on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis by haykam can be found in this comment.
Linked Issues
Created Issue:
Minecarts in cobwebs clipping though pistons
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video for more information on how to setup this glitch.
Environment
Tested on both versions 1.11 and 1.16.4 of Minecraft on MacOS Catalina. Presumed to still occur pre-1.11 but not tested or listed.
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video
for more information on how to setup this glitch.Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
![[Mod] Anthony Cicinelli](../../../data/avatars/users/10122.svg){kind=small}
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall throughExpected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the minecart up a full block and the minecart to sink through the cobweb
Actual Result:
The minecart is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the minecart clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecart on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Minecarts in cobwebs clipping though pistonsEntities in cobwebs clipping though pistons
Expected Result:
The piston to push the
minecartup a full block and theminecartto sink through the cobwebActual Result:
The
minecartis moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, theminecartclips into the piston body and sinks through the cobweb.Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place
minecarton the rail and break the rail- Nudge the
minecartinto the cobweb- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Flying Mobs (Bats, Bees, Phantoms, Ghasts) do clip into the piston but won't fall through
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
FlyingMobs (Bats, Bees,Phantoms,Ghasts) do clip into the piston but won't fall throughExpected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs without tag {NoGravity: 1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up ~half a block and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs with
outtag {NoGravity: 1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up
~half a blockand becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs with tag {NoGravity: 1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs with tag {NoGravity: 1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs with tag {NoGravity: 1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs with tag {NoGravity: 1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs with tag {NoGravity: 1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When performed with the player, it places the player in swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When
performed with theplayer, it places the playerin swim modeIn response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
When a player is pushed within the cobweb, they are put into swim mode.In response to Marty McFly's comment, Now tested for all spawn egg mobs:
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
This glitch also affects Minecarts that are still on rails.Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo)
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo)
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Updates:Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up 0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Tested on both versions 1.11 and 1.16.4 of Minecraft on MacOS Catalina. Presumed to still occur pre-1.11 but not tested or listed.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head.
When the piston is retracted, the entity clips into the piston body and sinks through the cobweb.Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Actual Result:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
![[Mod] ampolive](../../../data/avatars/users/18949.svg){kind=small}
Expected Result:The
piston to push the entity up a full block and the entity tosink through the cobweb.
ActualResult:The
entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body andsinksthrough the cobweb.Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}
Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis can be found in [this comment].
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis
can be found in[this comment].
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place entity on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis by haykam can be found in this comment.
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place
entityon the rail and break the rail- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis by haykam can be found in this comment.
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place on the rail and break the rail
- Nudge the entity into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis by haykam can be found in this comment.
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place
on the rail and break the rail- Nudge the
entityinto the cobweb- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis by haykam can be found in this comment.
The bug:
The entity is moved up ~0.05 blocks (established using carpets mod's tick freeze) and becomes stuck in the piston head. On versions 1.2.1-1.19.4, when the piston is retracted, the entity clips into the piston body and sinks through the cobweb.
Expected Result:
The piston to push the entity up a full block and the entity to sink through the cobweb.
Steps to Reproduce:
- Place piston, facing upwards
- Place rail on top of piston
- Place cobweb to the top and left of the piston
- Place minecraft on the rail and break the rail
- Nudge the minecart into the cobweb
- Ensure there are no block underneath the cobweb
- Power and de-power the piston (slowly)
See the video and photos for more information on how to setup this glitch.
Responses:
Now tested for all spawn egg mobs (in response to Marty Mcfly):
- Doesn't affect Spiders / Cave spiders, as these mobs are not slowed by cobwebs.
- Doesn't affect flying mobs (Bees, Bats, Ghasts, Phantoms) or mobs summoned with
/summon minecraft:creeper ~ ~ ~ {NoGravity:1b}Now tested for short duration pulses (in response to Gnamf Jojo):
- Works for all pulses, down to 0-tick pulses (make sure there's no block under the cobweb)
Updates:
When a player is pushed within the cobweb, they are put into swim mode.
This glitch also affects Minecarts that are still on rails.
Code analysis
Code analysis by haykam can be found in this comment.
![[Mod] Jarl-Penguin](../../../data/avatars/users/92849.png){kind=small}
is duplicated by
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
Would MC-277155 or MC-211096 describe your issue?
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Can confirm.
Affects 21w05b
This seems to affect all entities.
Agree. Affects all entities. Can reproduce. Does not work if using an impules to power piston
Can confirm in 21w13a.
Can confirm in Minecraft 1.19.4. It also affects powder snow (when moving horizontally) and sweet berry bushes.
Code analysis (Yarn mappings)
Cobwebs, powder snow, and sweet berry bushes use the Entity#slowMovement method as well to affect movement. This method sets a multiplier field which is used to multiply the movement distance when the Entity#move method is called. Typically, this allows a multiplier to be set for when the entity updates its position in the next tick.
However, additional movement can be applied from other sources, such as pistons and shulkers. In these cases, the movement multiplier affects the external source of movement rather than the entity's own movement.
To fix this issue, the Entity#move method should simply check the MovementType before applying the movement multiplier.
This behavior still exists in Minecraft snapshot 23w14a.
Can confirm in 24w45a.
This bug is related to this bug report too: MC-278182
It is crucial to fix this bug for proper, consistent behavior from item entities when moved by pistons
haykam's bug solution would be valid, as explained here:
MC-278255Furthermore, powder snow can cause the same bug too (1.17+ as the block was introduced back then)