Llamas have an incorrectly sized hitbox until they are reloaded.
It looks like they might have the horse hitbox (not as tall as llamas but wider).
- Spawn in a llama in a 1x1 hole with solid blocks as the walls
- Observe that it suffocates, although a llama is 1x1 and should fit in the space
- Spawn in a llama and try to push it against a wall (nudging/piston/water)
- The llama cannot be fully pushed against the wall