Resolution: Awaiting Response
Minecraft 14w26c, Minecraft 14w30c, Minecraft 14w33c, Minecraft 14w34b, Minecraft 1.8-pre1, Minecraft 1.8-pre2, Minecraft 1.8-pre3, Minecraft 1.8, Minecraft 1.8.1-pre2, Minecraft 1.8.1, Minecraft 1.8.2-pre1, Minecraft 1.8.2-pre3, Minecraft 1.8.3, Minecraft 15w32b, Minecraft 1.10.2, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 1.12.1, Minecraft 1.12.2
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.
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
- Get to a nearby village, for example by using /locate Village, and wait for the zombies to spawn
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.