I found another bug where the enemies turn invisible and fall through the map and if this happens to a boss you can't complete the level. From what I understand it happens when they fall or when the roof is to low.
Yeah, I've been trying to fix that one for a while, it seems to have quite a few things that can cause it, but I've never had it with a boss. Which boss did it to you
the first boss, I revisited the boss when I finally got enough capacity to vore it at low health so i vored it just for it to escape at the boss room's entrance gap, go invisible and fall through the map after 1 sec.