I got a weird bug thingy on my orc town, in the forest, as it's shown on this vid:
My thought is that the gate's upgrade didn't take into account the hill where it's the rest of the buildings, and it went to the -0 level of height. As you can see, there is a little part of the animation when you open the gate or close it that can be seen. Units can't pass if it's closed, so it's probably a hitbox glitch. I don't know if it can be hit by siege weapons and that stuff, but probably yes.
I think that's all.
Edit: Well now it fixed itself, so idk.