Thank you for the thorough feedback! It's appreciated! It's seems that the floor issue is common, do you remember approximately where it was so we can patch it for after the jam?
For me it happened right between the room of the bull Boss and the Save nest before it. I did a quick "enter room and go back immediatelly" because I wanted to record the boss (for no particular reason, really, I just like doing that) there and then I clipped.
Since a lot of other people seemed to report clipping into the Backrooms too I assume this can happen anytime you swap rooms too fast tho, but that I can't say for sure.