Upon entering the Top floor of Neon Flats, one of the creation club apartments located in Goodneighbor, the issue occurs as soon as the 2nd elevator's doors open: I begin falling through the ground. Eventually I am below all of Goodneighbor, and of course I am soft locked down there, unable to escape.
I can still access the middle floor, but the top floor currently remains inaccessible. How can I fix this? I'm concerned this is permanent and I wanted to build a nightclub up there.
Edit: Not sure if version matters, but I'm on Steam/PC.