Still happening in 1.07. All AI units run through our base walls at will. Zombies have chased pigs inside several times, wolves run in freely but tend to get stuck on their way out when trying to flee. Zeds will get stuck for a few seconds when pushing through the watch tower wall, but they get through after 5-10 seconds. No bear spawns near this base, but I've seen them run through base walls as if made of air.

Since the AI choose the same route into the base every time - the outer watchtower wall - where there is a tree branch clipping through the wall (I built the tower when the tree was felled, okay...) it seems to me as if object collisions seem to be at least partly responsible for AI pathing ignoring base walls. Could be worth checking out?

Also, when a base element has been built so a bush/tree will clip upon respawn at server restart - please make it so the tree will not respawn. Clearing ground to be able to build is an age-old practice. Trees don't grow back overnight, especially if you have built something where they used to be... Additionally, it would add to the authenticity if you wouldn't get logs and firewood immediately upon felling the tree. You should first need to fell the tree and then cut it up into logs and firewood - which should also remove the model of the felled tree. I will post this as a separate suggestion.

When will it be fixed? It's been 4 years, I understand =(