I was doing the orb puzzle room that leads to endless dungeon, and in the middle of it my summoned skeleton dudes started attacking thin air for a couple of hundred turns. Only a few of them do, the rest are fine. I've walked all around that room, there are no enemies there.Here's a log, but it doesn't show any errors around that time.
Here's a savegame in case you need it.
Summoned skeletons attacking empty space
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