Juuuust when I thought I was gonna finish this game.
I am gonna try to talk about this bug while avoiding spoilers.
Turns out I reeeeaaally shouldn't have bought one of the students' abilities before the final trial.
That makes one of the non-stop debate sessions impossible on my side for some reason.
This student's ability is to remove the delay of scanning orange texts, but in the final trial, there is a part where players are required to scan thrice. The first scan worked fine, but after that I can't scan texts anymore no matter how much I spam "X".
I replayed again to make sure. The same issue happened.
I have overwritten too many save files... Might need to go very far back just to complete the game...
Despair.