Definitely sounds worth sending your save file and a bug report directly to Larian. You can do this via the “Feedback” option on the launcher or at https://larian.com/support/baldur-s-gate-3#modal, and attach a zipped version of the folder containing the save and its associated thumbnail.

"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"