Yeah, I've had a zombie bear clip through the walls of the trader base (I thought I was safe picking it off from the top of the base wall, but no, it clipped inside.
I then ran into the traders trailer, and the #$%^ bear followed me, and pushed itself all the way in, leaving me with nowhere to go.
In a previous game I was in a largely underground POI in the wasteland. Bears were going nuts on the surface. In the room at the surface there were 1m x 2m doors on 2 sides, with bears clipping through both doors. 4 zombie bears, plus dogs... a bit too savage for a single player game.
Also, these bears take an immense amount of melee hits before they die. If we can't outrun them, and can't kill them, and can't safely hide from them, then what is the point to them?