Hey Simmers, I'm not sure what to call this bug but if you've found other threads discussing the same thing please link them or let me know. I have a one Sim household who went to University. Sh...
@JNarz19 I'm not sure if collectibles remain in the house, that's why I suggested moving them to inventory first. You could give it a try and see what happens, only don't save your game just in case.