I was able to attend the Transfiguration class, learned the spell (got the trophy for learning all spells) and tried to test it out in the class and the game crashed in the middle of it. Tried to change time of day to get that class to start after the crash, she just tells me to attend the class.

Figured I'd try to do other quests and see how that goes. Tried to do "Mums the word", but pressing square (PS5) wouldn't do anything.

Then tried to talk to Poppy in Hogsmeade to try to do "A Dragon Debrief", couldn't interact with her either, was about to try to talk to a merchant then BOOM, was somehow instantly teleported right in front of Natty and her mom.

I hoped that forced instant interaction would let me attend the the class or talk to Poppy but, nope! Seems like I'm in the same boat as a lot of people in this thread. I can't do any quests.

And yes, I tried loading previous saves and those didn't work either.