It's kind of immediate, here is a screenshot : https://imgur.com/a/F8L2rTW (the "cancel" button becomes a "close the program button" afterwards).
I got some other crashes but I've no precise idea when, the one when I use the stairs is consistent (happens everytime).
I get my character sprite turned into a @ sometimes (maybe it's just after a possession), not really a problem and maybe it's not even a bug but just in case it's a bug and it's linked.