I'm in a slow plains biome and the ground is covered in snow. Mobs ( and chickens ) stand there jumping like idiots and not moving. Removing the snow cover fixes it.
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Relates to MC-13660.
Maybe caused by the fix of MC-8881
Second-hand apologies for that. Suppose it'd be a little more work for an exact solution AI-wise, since it'd be looking for the data saying how tall the snow is. Hopefully it isn't too complicated to adjust for.
From Reddit:
And to clarify what is happening: Mobs originally always treated layered snow as collision-less or half height, as they used to be. When they made snow have collision based on how high it is, mobs would get stuck on snow more than a half slab of collision height. The bug report was asking for them to recognize when they needed to jump up onto higher snow. However, the fix was making them think all layered snow was full blocks... So they think they are inside a block, jumping up onto a block, and are stuck.
Confirmed.