I think it is bugged, I got to that part, but the door isn't open.
Thank you for your feedback.I tested the game in the downloadable version and I played both girls routes, everything worked fine.
But I had a very old save in the editor version where I save before every mission for testing and the door is closed for both girls missions. Maybe there is something wrong with the way I set up the trigger for the door to open but again when I test it, it works fine.