Entity riding an entity can cause location/coordinate desync
The bug
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding gets moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple /tp and /kill method, but the tnt method produces a more noticeable desync than just the /tp and /kill method. I will post a video showing the tnt and showing the /tp & /kill method.
How to reproduce
- Create a world and summon a saddled pig riding a minecart:
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]} - Ride the pig
- Grab some command blocks.
- Enter this command to kill the minecart quickly:
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]
- In another command block that will come after the /kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 10000
- Your position will be different than the your player client. To check this, run this:
/data get entity @s Pos
as well as check your f3 screen for your client coordinates
Videos
Tnt methods
Result 1: https://youtu.be/AhEzkJxQwDo
Result 2: https://youtu.be/aBG3BjK4cRo
Tp method:
Result 1: https://youtu.be/1aE4IbkSgrA
Linked Issues
relates to5
MC-173404Desync when mounting an entity while sneakingFixedMC-190454Desync when a player rides a horse riding another mob, and that mob diesFixedMC-260632Riding an entity that is far away causes client/server desyncFixedMC-256561Boat, boat with chest, bamboo raft or bamboo raft with chest instant wrong direction after dismounting
LowMC-212291Client can dismount vehicles independently from the server, causing a de-syncFixed
NormalCreated Issue:
Entity riding an entity desync
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if a TNT blows up the minecart and does kill the pig.
Steps:
- Create a world and summon a saddled pig riding a minecart.
- Ride the pig
- Place TNT a little bit away from you and light it.
- Wait till the TNT blocks up the minecart.
- Walk away from the pig (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if a TNT blows up the minecart and does kill the pig.
Steps:
- Create a world and summon a saddled pig riding a minecart.
- Ride the pig.
- Place TNT a little bit away from you and light it.
- Wait till the TNT blocks up the minecart.
- Walk away from the pig (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if a TNT blows up the minecart and does kill the pig.
Steps:
- Create a world and summon a saddled pig riding a minecart.
- Ride the pig.
- Place TNT a little bit away from you and light it.
- Wait till the TNT blocks up the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if a TNT blows up the minecart and does kill the pig.
Steps:
- Create a world and summon a saddled pig riding a minecart.
- Ride the pig.
- Place TNT a little bit away from you and light it.
- Wait till the TNT blocks up the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if a TNT blows up the minecart and does kill the pig.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it.
- Wait till the TNT blocks up the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if
a TNT blows up the minecart and does kill the pig.Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it.
- Wait till the TNT blocks up the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser will arrow.
- Wait till the TNT blocks up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser wi
llarrow.- Wait till the TNT blocks up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows.
- Wait till the TNT blocks up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows.
- Wait till the TNT blocks up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbygsbugs below, you can use this command as well /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blocks up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsb
ygsbugs below, you can use this command as well/kill @e[type=minecraft:minecart,distance=..2])- Wait till the TNT blocks up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbugsbugs below, you can use this command as well: /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blocks up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbugsbugs below, you can use this command as well: /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blo
cks up the minecart or the arrows kill the minecart.- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart x y z {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbugsbugs below, you can use this command as well: /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart
x y z{Passengers:[ {id:pig,Saddle:1,Invulnerability:0}]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbugsbugs below, you can use this command as well: /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart ~ ~4 ~{Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbugsbugs below, you can use this command as well: /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart. /summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}
]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbugsbugs below, you can use this command as well: /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. (As suggested by bugsbugsbugs below, you can use this command as well: /kill @e[type=minecraft:minecart,distance=..2])
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0} ]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. As suggested by bugsbugsbugs below, you can use this command as well:
/kill @e[type=minecraft:minecart,distance=..2]
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0} ]}
- Ride the pig.
- Place TNT a little bit away from you and light it or use a dispenser with arrows. As suggested by bugsbugsbugs below, you can use this command as well:
/kill @e[type=minecraft:minecart,distance=..2]
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0} ]}
- Ride the pig.
Place TNT a little bit away from you and light it or use a dispenser with arrows. As suggested by bugsbugsbugs below, you can use this command as well:/kill @e[type=minecraft:minecart,distance=..2]
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0} ]}
- Ride the pig.
- Enter the command below to kill the minecart quickly.
/kill @e[type=minecraft:minecart,distance=..2]
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
- Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0} ]}
- Ride the pig.
- Enter the command below to kill the minecart quickly.
/kill @e[type=minecraft:minecart,distance=..2]
- Wait till the TNT blows up the minecart or the arrows kill the minecart.
- Walk away from the pig. (avoid hitting shift/sneak)
- Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Enter the command below to kill the minecart quickly.
/kill @e[type=minecraft:minecart,distance=..2]4. Wait till the TNT blows up the minecart or the arrows kill the minecart.
5. Walk away from the pig. (avoid hitting shift/sneak)
6. Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Enter the command below to kill the minecart quickly.
/kill @e[type=minecraft:minecart,distance=..2]
4. Wait till the TNT blows up the minecart or the arrows kill the minecart.
5.Walk away from the pig. (avoid hitting shift/sneak)6. Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[ {id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Enter the command below to kill the minecart quickly. (Survival players can use TNT or arrows from dispensers)
/kill @e[type=minecraft:minecart,distance=..2]5. Walk away from the pig. (avoid hitting shift/sneak)
6. Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Enter the command below to kill the minecart quickly. (Survival players can use TNT or arrows from dispensers)
/kill @e[type=minecraft:minecart,distance=..2]5. Walk away from the pig. (avoid hitting shift/sneak)
6. Enjoy trying to place blocks.
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Enter the command below to kill the minecart quickly (as suggest by bugsbugsbugs ). (Survival players can use TNT or arrows from dispensers)
/kill @e[type=minecraft:minecart,distance=..2]5. Walk away from the pig. (avoid hitting shift/sneak)
6. Enjoy trying to place blocks.
Video:
![[Mod] SPGoding](../../../data/avatars/users/44622.png){kind=small}
![[Mod] Chandler](../../../data/assets/gravatar/triwonder81.png){kind=small}
![[Helper] Jack McKalling](../../../data/avatars/users/92859.png){kind=small}
![[Helper] Johnibur](../../../data/avatars/users/28381.png){kind=small}
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
relates to
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive.
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Enter the command below to kill the minecart quickly
(as suggest by bugsbugsbugs ). (Survival players can use TNT or arrows from dispensers)/kill @e[type=minecraft:minecart,distance=..2]
5.Walk away from the pig. (avoid hitting shift/sneak)
6. Enjoy trying to place blocks.Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding get moved into an unloaded chunk while riding the dead minecart. This can either be achieved tnt or a tp and kill command. Here I will show a simple tp and kill method, but the tnt method produces a more noticeable desync than just the tp and kill method. I will post a video showing the tnt and showing the tp kill method
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Grab some command blocks.
3. Enter the command below to kill the minecart quickly
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]4. In another command block that will come after the kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 100005.
Your position will be different than the your player client. To check this, run this:
/data get entity <NAME> Posas well as check your f3 screen for your client coords
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding get moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple tp and kill method, but the tnt method produces a more noticeable desync than just the tp and kill method. I will post a video showing the tnt and showing the tp kill method
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Grab some command blocks.
3. Enter the command below to kill the minecart quickly
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]4. In another command block that will come after the kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 100005.
Your position will be different than the your player client. To check this, run this:
/data get entity <NAME> Posas well as check your f3 screen for your client coords
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding gets moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple tp and kill method, but the tnt method produces a more noticeable desync than just the tp and kill method. I will post a video showing the tnt and showing the tp kill method
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Grab some command blocks.
3. Enter the command below to kill the minecart quickly
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]4. In another command block that will come after the kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 100005.
Your position will be different than the your player client. To check this, run this:
/data get entity <NAME> Posas well as check your f3 screen for your client coords
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding gets moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple tp and kill method, but the tnt method produces a more noticeable desync than just the tp and kill method. I will post a video showing the tnt and showing the tp kill method
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Grab some command blocks.
3. Enter the command below to kill the minecart quickly
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]4. In another command block that will come after the kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 100005.
Your position will be different than the your player client. To check this, run this:
/data get entity <NAME> Posas well as check your f3 screen for your client coords
Video:
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding gets moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple tp and kill method, but the tnt method produces a more noticeable desync than just the tp and kill method. I will post a video showing the tnt and showing the tp kill method
Steps:
1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Grab some command blocks.
3. Enter the command below to kill the minecart quickly
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]4. In another command block that will come after the kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 100005.
Your position will be different than the your player client. To check this, run this:
/data get entity <NAME> Posas well as check your f3 screen for your client coords
Video:
Tnt methods:
Results 1: https://youtu.be/AhEzkJxQwDo
Result 2: https://youtu.be/aBG3BjK4cRo
Tp method:
Result 1: https://youtu.be/1aE4IbkSgrA
The bug:
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding gets moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple tp and kill method, but the tnt method produces a more noticeable desync than just the tp and kill method. I will post a video showing the tnt and showing the tp kill method
Steps:1. Create a world and summon a saddled pig riding a minecart.
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}2. Ride the pig.
3. Grab some command blocks.
3. Enter the command below to kill the minecart quickly
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]4. In another command block that will come after the kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 100005.
Your position will be different than the your player client. To check this, run this:
/data get entity <NAME> Posas well as check your f3 screen for your client coords
Video:
Tnt methods:
Results 1: https://youtu.be/AhEzkJxQwDo
Result 2: https://youtu.be/aBG3BjK4cRo
Tp method:
Result 1: https://youtu.be/1aE4IbkSgrA
The bug
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding gets moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple /tp and /kill method, but the tnt method produces a more noticeable desync than just the /tp and /kill method. I will post a video showing the tnt and showing the /tp & /kill method
How to reproduce
- Create a world and summon a saddled pig riding a minecart:
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}- Ride the pig
- Grab some command blocks.
- Enter this command to kill the minecart quickly:
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]- In another command block that will come after the /kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 10000- Your position will be different than the your player client. To check this, run this:
/data get entity @s Posas well as check your f3 screen for your client coordinates
Videos
Tnt methods
Result 1: https://youtu.be/AhEzkJxQwDo
Result 2: https://youtu.be/aBG3BjK4cRoTp method:
Result 1: https://youtu.be/1aE4IbkSgrA
Entity riding an entity can cause desync
The bug
When a saddled pig rides a minecart and then the player rides the pig, a desync will happen if the minecart dies and pig is still alive. However, since 21w05a, a new method is needed. It seems to only work now if the pig your riding gets moved into an unloaded chunk while riding the dead minecart. This can either be achieved by using tnt or a tp and kill command. Here I will show a simple /tp and /kill method, but the tnt method produces a more noticeable desync than just the /tp and /kill method. I will post a video showing the tnt and showing the /tp & /kill method.
How to reproduce
- Create a world and summon a saddled pig riding a minecart:
/summon minecraft:minecart ~ ~4 ~ {Passengers:[{id:pig,Saddle:1,Invulnerability:0}]}- Ride the pig
- Grab some command blocks.
- Enter this command to kill the minecart quickly:
/kill @e[type=minecraft:minecart,limit=1,sort=nearest]- In another command block that will come after the /kill command enter the following command:
/tp @e[type=pig,limit=1,sort=nearest] 10000 100 10000- Your position will be different than the your player client. To check this, run this:
/data get entity @s Posas well as check your f3 screen for your client coordinates
Videos
Tnt methods
Result 1: https://youtu.be/AhEzkJxQwDo
Result 2: https://youtu.be/aBG3BjK4cRoTp method:
Result 1: https://youtu.be/1aE4IbkSgrA
Entity riding an entity can cause location/coordinate desync
![[Mojang] Adrian Östergård](../../../data/assets/gravatar/nighter.jpeg){kind=small}
![[Mod] Avoma](../../../data/avatars/users/86198.png){kind=small}
Relates to
MC-191714.
is duplicated by
is duplicated by
![[Mod] ampolive](../../../data/avatars/users/18949.svg){kind=small}
![[Mod] Les3awe](../../../data/avatars/users/79847.png){kind=small}
relates to
relates to
![[Mojang] Gegy](../../../data/avatars/users/10122.svg){kind=small}
[Mojang] Gegy![[Bot] Piston](../../../data/avatars/users/31202.png){kind=small}
This bug report is a continuation of MC-202202, as it was only partially fixed in 21w03a.
The bug
A change in snapshot 20w22a allows the client to dismount a vehicle independently from the server, causing a de-sync between the two. This can be triggered in a variety of ways, see How to reproduce.
When this de-sync occurs, the server will see the player as riding in the vehicle, while the client (the player) sees themselves as dismounted from the vehicle, allowing them walk around freely. Walking around and attempting to break blocks far away from the vehicle will cause vanilla anti-cheat to prevent the blocks from being broken, as the server still thinks the player remains mounted on the vehicle and cannot possibly break blocks that far. Sneaking causes the player to teleport back to the vehicle, as the server thinks the player has just dismounted the vehicle.
This issue was initially reported as MC-202202, which observed that in snapshot 20w09a code was added to the client which allowed it to dismount a vehicle independently from the server using the sneak key. Since this caused de-sync issues during lag spikes, it was reverted in 21w03a leaving MC-202202 resolved.
However, the implemented fix for MC-202202 in 21w03a only considered situations when the client uses the sneak key to dismount. It was also noted in MC-202202 that snapshot 20w22a added a way for clients to dismount a vehicle independently from the server during situations not caused by the sneak key, such as when the vehicle moves through a block. This discovery was only reported on MC-202202 a short amount of time before the release of 21w03a, likely being the reason why MC-202202 was not entirely fixed.
The rest of this bug report covers the unresolved part of MC-202202, where the client can decide to dismount its own vehicle in situations not caused by sneaking, leading to a de-sync.
Impact
This bug leads to a de-sync between the client and the server in several scenarios during vanilla gameplay, causing undesirable behavior. Some of these scenarios in the past have been reported as their own bugs, such as MC-190454, MC-191714, MC-200286, MC-201647, and MC-205477. Fixing this bug using the proposed fix (see Code Analysis) will resolve all of these issues, as I was unable to reproduce any of them with the fix (see Workaround).
This bug can additionally cause a de-sync on third-party servers if the server attempts to keep a player mounted on a vehicle through third-party modifications to the server software. This is a common mechanic used on minigame servers when the player must remain in a vehicle, such as a minecart on a roller coaster. While this was primarily fixed with 21w03a, situations where the client dismounts its own vehicle when not using the sneak key still cause a de-sync. For example, the client currently decides to dismount its vehicle when the vehicle moves through a block, which does not require using the sneak key, leading to a de-sync. This did not occur on versions prior to 20w22a. By implementing the proposed fix, this no longer happens and prevents buggy behavior on these third-party servers.
How to reproduce
We may observe the effects of this bug by looking at the other reported issues which are directly caused by this bug. See MC-190454, MC-191714, MC-200286, MC-201647, and MC-205477.
The reproduction steps of MC-191714 are provided below, which shows this bug. When the farmland is turned into a full dirt block, the horse becomes inside the block, causing the client to decide to dismount the house and create a de-sync
- Join a world in Creative mode with cheats enabled using version 20w22a or higher
- Run the command /gamerule randomTickSpeed 0
- Run the command /fill ~-3 ~-1 ~-3 ~3 ~5 ~3 minecraft:glowstone hollow
- Run the command /fill ~-2 ~-1 ~-2 ~2 ~-1 ~2 minecraft:farmland
- Run the command
/summon minecraft:horse ~ ~ ~ {Invulnerable:1b,NoAI:1b,PersistenceRequired:1b,SaddleItem:{id:saddle,Count:1},Tame:1} - Mount the horse
- Jump at least 1 block in the air with the horse, so the farmland is broken and you are dismounted from the horse
→
Notice the de-sync. Walking around and attempting to break blocks far away from the horse will cause anti-cheat to prevent the blocks from being broken, as the server still thinks the player remains mounted on the horse. Sneaking causes the player to teleport back to the horse, as the server thinks the player has just dismounted the horse.
Another example of this bug can be found in MC-190454, with steps to reproduce shown below. When the husk dies, the client decides to dismount the horse, creating the de-sync.
- Join a world in Creative mode with cheats enabled using version 20w22a or higher
- Run the command
/summon minecraft:husk ~ ~ ~ {NoAI:1b,Passengers:[{id:"minecraft:horse",Invulnerable:1b,NoAI:1b,PersistenceRequired:1b,SaddleItem:{id:saddle,Count:1},Tame:1b}]} - Mount the horse
- Run the command /summon minecraft:tnt
→ Notice the de-sync. Walking around and attempting to break blocks far away from the horse will cause anti-cheat to prevent the blocks from being broken, as the server still thinks the player remains mounted on the horse. Sneaking causes the player to teleport back to the horse, as the server thinks the player has just dismounted the horse.
This bug can also be seen through MC-200286.
- Join a world in Creative mode with cheats enabled using version 20w22a or higher
- Run the command /fill ~ ~-1 ~ ~ ~-1 ~5 minecraft:obsidian
- Run the command /summon minecraft:end_crystal ~ ~ ~5
- Run the command /summon minecraft:boat ~ ~ ~2
- Mount the boat
- Row the boat forward 3 blocks or until inside the end crystal
- Look down and right click the boat
→ Notice the de-sync. Walking around and attempting to break blocks far away from the boat will cause anti-cheat to prevent the blocks from being broken, as the server still thinks the player remains mounted on the boat. Sneaking causes the player to teleport back to the boat, as the server thinks the player has just dismounted the boat.
Code analysis
In snapshot 20w22a, a change was made in the handleMovePlayer() method in net.minecraft.client.multiplayer.ClientPacketListener. This change added a conditional statement that allows the client to dismount a vehicle using the removeVehicle() method. In order to fix this bug, this change would need to be reverted. By doing so, it should no longer be possible to dismount an vehicle on the client, preventing any de-sync issues that may occur.
It may be possible that this was added to fix another bug or intentionally change behavior. In this case, reverting this change would not be beneficial to the game. We can check the changelog and fixed bugs from 20w22a relating to entity mounting in order to see if this is true. The bugs that fit this category are MC-182967, MC-184629, and MC-184640, and changes that fit this category include the prevention of mounting entities while the shift key is held. I was unable to reproduce these resolved issues and was still unable to mount entities when the shift key was held using the proposed fix, meaning that the proposed fix in this issue should not conflict with other changes or issues from 20w22a.
Workaround
The current workaround is to implement the proposed fix described in the Code Analysis section. A client-sided Fabric mod does this for versions 1.16 through 1.16.5 and snapshots 20w22a through 20w51a, with the source code linked here. Use the modification at your own risk, please audit and compile the code from source to ensure safety. As this modification was meant to fix MC-202202, it does not work with snapshots 21w03a or later which contains a partial fix for MC-202202. This also means it back-ports the partial fix for MC-202202 from 21w03a to earlier versions of the game. If you wish to fix this bug in versions 21w03a or later, it is possible to modify the source code and recompile the modification, however this process is not in the scope of this bug report and will not be described here.
The bug
Riding an entity that is far away causes client/server desync. I am not sure if this is distinct from MC-201647.
Steps to reproduce
For these steps, I will use a sheep.
- Create a new world with this seed: 7747585803886593516.
- Ensure that there are no sheep nearby.
- /ride @s mount @e[type=sheep,limit=1,sort=nearest]
- Notice that the command was successful, but your visual position hasn't changed.
Observed behavior
The visual position doesn't change, and you become unable to interact with the world. Sometimes you get stuck as if you were actually riding the entity.
Expected behavior
You would be teleported to the sheep's location correctly.
![[Helper] clam lol](../../../data/avatars/users/92852.png){kind=small}
This issue was fixed in 23w12a as part of the fix for MC-201647. However, passengers are not teleported instantaneously (as they are when teleporting them directly); it seems like the chunk they're being teleported to must finish loading first. I may decide to make a separate ticket for this.
I can confirm for 1.16.3
A quicker way to reproduce this is just running this command when riding the pig:
This also works with striders. You can also hold a carrot on a stick/warped fungus on s stick to rotate the mob, but it won’t move.
Can confirm in 20w51a.
Can this still be reproduced in 21w05 or later?
I was not able to reproduce it in 21w05a [^Minecraft 2021.02.03 - 20.00.22.06.mp4]
I also wasn’t able to reproduce this. This is fixed,
I can reproduce it via other means. Let me update the method.
With the newer reproduction steps I am able to reproduce.
This report is also reproduced by
MC-217736Hello!
I have been having that issue too but man, I'm glad the new update finally fixed it.
Thanks for reading