after i defeated the beast, i decided i wanted to turn my in-music off cuz I was listening to my own music, I ended up cancelling out the beast's teleport and was stuck in the final room with no escape (if it wasnt for auto saving this run would be dead and i wouldn't have been able to record a video to show an issue)
since i'm already bring this issue up, a similar softlock can occur if you manage to fall out of the map after the beast teleports you, and you don't hit the spots that end the run or put you into new game plus