Bear issue: player need to stay inside a house while a bear outside wants to kill him, doors closed. The bear imidiately glitches with his head trough the door and can damage the player and the player can damage the bear. After several tries the bear glitches completely in the closed room where the player is.

Zombie issue: they glitch trough walls and doors as well, but not completely and unable to damage the player, the player can damage the zombies tough.

Same thing like with zombies happened with wolfs.

Zombies sometimes stuck in the open world and walk on point (looks a bit like a moonwalk). If the player trigger them, they aren't able to chase the player but sometimes they can move after a while for a unknown reason.
Sometimes they glitch on top of buildings for a unknown reason if they try to attack the player, they aren't able to get down from the roof after that.