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Villagers crowd into a single building

Zombies only fight back against players

Enderman cannot dodge flame arrow. When the arrow is shot the Enderman moves out of the way but is still set on fire

Endermen in daylight do not freeze when looked at, do not stay angry

Ghasts and Witches Do Not Aim Properly

Mobs do not realize that they can move between fence posts next to nether brick fence.

New Mob AI doesn't take world limit/Void into account for pathing

Signs, Sugar Cane, Vines, Two-block Plants and Cobwebs cause glitchy mob behavior

Mob and Fence Interaction

Villagers spinning around outside houses at night

Iron golems spawned in a village walk around 1 place

Zombies Can be Dumb

Mob pathing updates on a delay

Deep water = Mobs forget AI

Skeleton continues to shoot mob after it has died

mobs avoiding track AI isn't very reliable jet.

Zombies do not react to being attacked by other mobs

Mobs treat any layered snow as non-solid

Mobs with the old AI have inverted head movement

Angry Zombie Pigmen usually won't jump over 1-high transparent blocks to get to enemies.

Zombies do not break doors on any difficulty.

ZOmbies behave like zombie pigman inside creative mode

Wither skeletons and zombie pigmen won't go through lava to get to enemies, even though they can't burn

Tamed wolves don't attack horses

Hostile mobs don't respond to attacks in creative

Skeleton keep shooting dead mob

Zombie AI + Unreachable village = 100% CPU

Lead & weird Critter behavior

Bias in passive mob AI - still results in self-stranding passive mobs, even with Northwest bug fixed

Endermen do not teleport out of water, lava or when on fire