Hey! Thanks for your reply!
It’s definitely not AO, since there are no artifacts in the AO buffer. I’ve tried to move the mesh around a bit, and sadly it didn’t help.
I think I’ve traced the issue down to how the skylight works. If i set it to moveable or static, the problem still persists, but the artifact is much less noticeable. Guess I’ll have to dive into the documentation again to gain a better understanding of how skylights work.