Nothing is wrong with the quest or your save. I suggest you ensure you are using the to fix the study icon bug and study in the evening.
All I can say is, you are using a save that you saved using a mod or someone else saves that reset the save wrong.
Note: Certainly cannot be my mod
everything is working fine with my mod ![Sneaky :sneaky: :sneaky:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
This is what caused you the issue. You will get future problems, as your entire save will be messed up. I recommend a fresh save. Anyway, I still fixed your save for this part and only this time. As this is user related bugs.
Just enter and the scene would not freeze/crash the game anymore. BTW you didnt have to change the file extension, you could of simply zip it. This is what I did to send it back to you.