I found a bug today.
The short version: My character wound up in the same place as a plant.
The long version:
So, I'm currently worshipping Earthmother. At one point during the run, I was on a space some distance away from EM's altar, then I held down Ctrl to get a boon or two (I can't exactly remember which, but all except one of them spawn plants anyway), and then found that both my character and a plant were in the same exact square. Evidence pointing to this included the fact that there was a small "6" in the corner of the plant's space (which was actually my
level), and the fact that footprints indicating movement were originating from the plant's space. (I was able to move away from this space just fine.)
Screenshot of this evidence: http://i.imgur.com/hh8gVpF.jpg
(Never mind the fact that I'm playing a goblin
wizard, or the fact that I'm doing acidcaster very, very wrong)