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(+1)

There's a potential story soft-lock with the infirmary kid, if you walk into infirmary then out you can't walk back in even if you haven't seen the cutscene. I talked to headmaster and couldnt get back  in

Are you possibly talking about the door itself not being there for you to walk back into the room?
If you leave a map then the doors reset but yes, this should be addressed.

(+1)

ohhhhhhhhhhh, I guess I had to leave one more map down to reset the doors.

Yup, the doors and the rooms are on the same map.
The floors are separate maps.
Making the rooms separate maps would fix the issue but alternatively making the doors close after you go through works too. (The latter was chosen)