So, i was playing some Overrun on Or_Crashed with a buddy. And we noticed some of the ant-lions fly inside the Hills! and get stuck inside some rocks occasionally. This happens every so often in different waves. Especially the worker ant-lions get stuck, when they fly. This makes gameplay difficult, since you cannot attack them, but they can and will keep attacking you. It cripples your defense. They only tent to come out when either all your units close by are dead, and it needs a new target. Or when you lure it out, but that takes some effort But sometimes they just don't get out at all. And you can see them inside it too.
Surely this was spotted already?

but just in case it wasn't
I was using the Normal Steam build.