October - last edited October
@canelacalienteOkay, I tested now with the October 6th Patch (PC: 188.8.131.520) and I still see it happening.
I played Becca Clarke's second week and switched her to Foxbury, I selected three normal courses and one elective. She is reading Language and Literature.
This is what her first day looked like:
Class 1: 11:00 - 12:25 in building 1 (the one closest to the foxbury monument which can be vandalised)
Class 2: 13:30 - 14:45 in building 1 (the one closest to the foxbury monument which can be vandalised)
Class 3: 15:00 - 16:25 in building 2 (the other building)
She has no chance of getting to building 2 in time in 5 seconds. She always ends up late and loses performance.
Here is my save: Load the Clarke Household, it's just before she starts class, follow her and you will notice that when it is time for third class that she will not get there in time and will lose performance. https://drive.google.com/file/d/1VCcuFFREIEDsBOIj2xCYmd9t4DGKR4lx/view?usp=sharing