I'm lucky, this time the error i described happend again with Jenny in her room. Similiar errors I had in earlier events in her room.
Cedric event I added, now, too.
If I open the file, I get the following error in the spoiler.
If I make a rollback, go to the breakfast room, the event starts during breakfast again and you can see few more errors like in the first save file in Jenny's room.
The error in her room happens also if I am in her room without the rollback. I think the error while loading happens because I saved during a dialogue, what the game in the moment doesn't like.
And another error in the middle of the screen, this time even mirrored. Third file, go in the room to meet Diane.
The fourth file is the same as the first 7-2 file, but in front of Jenny's room not already in the dialogue with her.