Okay, noted!
Finished the route. It also happened during the onsen cg. Found out it also makes the sex life and dirty talk tab in the profile unusable. It black screens you when you click on them and try to leave.
There was also a thing after the sunday date event at the planetarium. Instead of the day ending it brought me back to sunday morning like it never happened. Could even do another date during it.
That was all I could find in this route. Hope this is helpful.