It is designed as a one-time event and you shouldn't be able to get in this location for the second time after unlocking tha baron's scene in the gallery. Problem is something went wrong with the saves. Reload an earlier save file to get out of there.
As for the save problem, it only happens on Itch and nowhere else you might want to describe the problem to the support. I suspect something happens witht he automatic update client from Itch since I didn't encounter such problems anywhere else and can't really help you.