Dumb suggestions just in case it is something going on at your end.
Restart your computer. I know, but sometimes that fixes things I thought were broken.
Restore to an earlier point in time. I've seen all sorts of advice that says that seldom helps anything but it's helped me more than once.
At least, you'll have tried something else. Btw, has BigFish tech help had any suggestions for you?
"Best not to think about it. I don't want to fall to bits 'cos of excess existential thought."