Siege zombies spawn inside some blocks
The bug
Siege zombies will spawn on the dirt/stone block underneath farmland blocks, slabs, and other non-opaque blocks. If there are two layers of non-opaque blocks, they can even spawn completely buried and unable to escape.
Note this is not the same issue as MC-57831, where mobs from spawners will spawn inside fully-opaque blocks.
How to reproduce
Village sieges only happen
- when the moon is at the zenith
- when a player (not being a spectator) is nearby
- when no second village is close
- when the village has at least 10 doors
- when the village has at least 20 villagers
- with a chance of 1 / 10
Because a siege only happens with a chance of 1 / 10 it is easier to cause one by having a clock (for example repeater) setting the time to day, waiting a short moment (for example one redstone tick), setting the time to 18000 and then waiting a little bit longer.
- Create a Superflat world with the following preset
3;minecraft:stone,minecraft:stone_slab,minecraft:web;1;village
- Get to a nearby village, for example by using /locate Village, and wait for the zombies to spawn
Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
Village sieges only require the method net.minecraft.world.WorldEntitySpawner.canCreatureTypeSpawnAtLocation(SpawnPlacementType, World, BlockPos) to return true. This means zombies can spawn
- in not-normal cube blocks
- even if there are already entities at that position
- right next to a player
- right next to light sources
Note: This method should probably not be used anymore because it always checks for two blocks even if the mob is smaller.
Linked Issues
is duplicated by7
MC-102830Zombies spawn stuck in grass path/farmlandDuplicateMC-105717Mobs spawning where they shouldn't be able to.DuplicateMC-112830Zombies will spawn halfway inside Grass Path Blocks in Villages during Apocalypse MoonDuplicateMC-119311Zombie SiegeDuplicateMC-120555Zombies spawn in ground during 'Zombie siege'.DuplicateMC-126098Mobs spawn in blocksDuplicateMC-129837Light level bug on Grass Paths and similar Duplicate
Created Issue:
Siege zombies spawn inside some blocks
Siege zombies will spawn on the dirt/stone block underneath farmland blocks, slabs, and other non-opaque blocks. If there are two layers of non-opaque blocks, they can even spawn completely buried and unable to escape.
Note this is not the same issue as
MC-57831, where mobs from spawners will spawn inside fully-opaque blocks.
is duplicated by
![[Mod] Pokechu22](../../../data/avatars/users/92931.png){kind=small}
![[Mod] Skylinerw](../../../data/assets/gravatar/skylinerw.png){kind=small}
is duplicated by
![[Mod] Neko](../../../data/avatars/users/92901.png){kind=small}
is duplicated by
Siege zombies will spawn on the dirt/stone block underneath farmland blocks, slabs, and other non-opaque blocks. If there are two layers of non-opaque blocks, they can even spawn completely buried and unable to escape.
Note this is not the same issue as
MC-57831, where mobs from spawners will spawn inside fully-opaque blocks.The bug
Siege zombies will spawn on the dirt/stone block underneath farmland blocks, slabs, and other non-opaque blocks. If there are two layers of non-opaque blocks, they can even spawn completely buried and unable to escape.
Note this is not the same issue as
MC-57831, where mobs from spawners will spawn inside fully-opaque blocks.Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
Village sieges only require the method net.minecraft.world.WorldEntitySpawner.canCreatureTypeSpawnAtLocation(SpawnPlacementType, World, BlockPos) to return true. This means zombies can spawn
- in not-normal cube blocks
- even if there are already entities at that position
- right next to a player
- right next to light sources
Note: This method should probably not be used anymore because it always checks for two blocks even if the mob is smaller.
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
The bug
Siege zombies will spawn on the dirt/stone block underneath farmland blocks, slabs, and other non-opaque blocks. If there are two layers of non-opaque blocks, they can even spawn completely buried and unable to escape.
Note this is not the same issue as
MC-57831, where mobs from spawners will spawn inside fully-opaque blocks.Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
Village sieges only require the method net.minecraft.world.WorldEntitySpawner.canCreatureTypeSpawnAtLocation(SpawnPlacementType, World, BlockPos) to return true. This means zombies can spawn
- in not-normal cube blocks
- even if there are already entities at that position
- right next to a player
- right next to light sources
Note: This method should probably not be used anymore because it always checks for two blocks even if the mob is smaller.
The bug
Siege zombies will spawn on the dirt/stone block underneath farmland blocks, slabs, and other non-opaque blocks. If there are two layers of non-opaque blocks, they can even spawn completely buried and unable to escape.
Note this is not the same issue as
MC-57831, where mobs from spawners will spawn inside fully-opaque blocks.How to reproduce
Village sieges only happen
- when the moon is at the zenith
- when a player (not being a spectator) is nearby
- when no second village is close
- when the village has at least 10 doors
- when the village has at least 20 villagers
- with a chance of 1 / 10
Because a siege only happens with a chance of 1 / 10 it is easier to cause one by having a clock (for example repeater) setting the time to day, waiting a short moment (for example one redstone tick), setting the time to 18000 and then waiting a little bit longer.
- Create a Superflat world with the following preset
3;minecraft:stone,minecraft:stone_slab,minecraft:web;1;village- Get to a nearby village, for example by using /locate Village, and wait for the zombies to spawn
Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
Village sieges only require the method net.minecraft.world.WorldEntitySpawner.canCreatureTypeSpawnAtLocation(SpawnPlacementType, World, BlockPos) to return true. This means zombies can spawn
- in not-normal cube blocks
- even if there are already entities at that position
- right next to a player
- right next to light sources
Note: This method should probably not be used anymore because it always checks for two blocks even if the mob is smaller.
is duplicated by
![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
is duplicated by
is duplicated by
is duplicated by
![[Mojang] Nathan Adams](../../../data/assets/gravatar/dinnerbone.png){kind=small}
![[Mod] CubeTheThird](../../../data/assets/gravatar/cubethethird.jpeg){kind=small}
relates to
![[Bot] Arisa](../../../data/assets/gravatar/mustek2.png){kind=small}
relates to
Duplicate of MC-59440 (I've updated the affected versions on that issue to list 1.10.2).
Note that this is a zombie siege upon your village, not normal spawning.
Zombies spawned within a siege ignore player proximity, light levels, and the presence of other mobs.
That said, them spawning inside of blocks is a glitch, although it's unrelated to the behavior of light levels on slabs (MC-46667).
The bug
Zombies spawned by a village siege do not spawn centered on a block, instead they use the block position coordinates. This can, combined with MC-59440, result in suffocating zombies.
How to reproduce
Village sieges only happen
- when the moon is at the zenith
- when a player (not being a spectator) is nearby
- when no second village is close
- when the village has at least 10 doors
- when the village has at least 20 villagers
- with a chance of 1 / 10
Because a siege only happens with a chance of 1 / 10 it is easier to cause one by having a clock (for example repeater) setting the time to day, waiting a short moment (for example one redstone tick), setting the time to 18000 and then waiting a little bit longer.
- Create a Superflat world with the preset "Classic Flat"
- Get to a nearby village, for example by using /locate Village
- Setup a repeating command block with the following command
/entitydata @e[type=zombie] {NoAI:1b} - Look at the zombies spawned by a village siege
→ They will be in the middle of four blocks
Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
The method net.minecraft.village.VillageSiege.spawnZombie() does not add 0.5 to the X and Z coordinate when calling net.minecraft.entity.Entity.setLocationAndAngles(double, double, double, float, float).
Thank you for your report!
However, this issue is a Duplicate of MC-59440.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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This is probably MC-59440 (Siege zombies spawn inside some blocks). Do you have villagers nearby? Then these are zombies spawned to attack those.
The code analysis of MC-59440 describes this difference and a few other ones, however it is not directly about this issue, so I only linked it as related.
Is this still an issue in 14w33c or newer?
Yes, it still occurs in 14w33c.
Occurs in 14w33c as well. Half-slabbed the entire 128 block radius, got siege zombies spawning inside of them.
Still exists in 14w34b
Still present in 1.8-pre1.
+1 support to confirmation, still present in 1.8-pre1
No one assigned to fixing this? My adventure map is ruined if this doesn't get fixed.
Still present in 1.8-pre2.
+1 support to confirmation, still present in 1.8-pre2
Still present in 1.8-pre3.
+1 to confirmation, still present in 1.8-pre3
Still present in 1.8.
+1 to confirmation, still present in 1.8.
Still present in 1.8.1-pre2.
Is this still an issue in 1.8.1 and 1.8.2-pre1?
Yes, still occurs in 1.8.2-pre1.
Still present in 1.8.2-pre3.
Still present in 1.8.3.
Still present in 1.10.2
Already marked as affected
Does this still occur in the latest release? (Currently 1.14.2)