Yeah I've actually got the exact same issue with my game using either the OP files or the patch and looking at the files myself there's just nothing that would trigger such a thing in either the event at the door or the lead up to the ending.That's the leftmost room on the second floor, with the cushions around the table.
Dunno about the ending. Post a save from just before you attempted to trigger the ending and maybe I can figure it out.