The iron golen should only spawn in 3 tall by 2 spaces, but he is spawning in 3 by 1 and he is going inside walls, or sometimes in 2,5 tall spaces like on botom slabs.
Sometimes he spawn in 2 tall spaces but I dont have proof.
MCPE-172594
Iron golem sometimes spawns in wall
Resolved
Duplicate
1
After reviewing the screenshots again, this is the same issue as MCPE-173006. When mobs that are too tall spawn in too-small areas they can glitch into the floor or through walls.