A bug that's been in the game for a while is that when you are tasked with talking to someone in an area, and you leave that area, you are locked out of progressing because the game doesn't allow you to return to that area. For example, if you have to talk to Monica in the classroom, and you leave the school before talking to her, you will not be allowed back into the school because the game will assume you already talked to her before leaving. At the same time, it's gonna see that you didn't talk to her, so you are left stuck in the world map with nowhere to go.
A solution to this could be to just open up the explorable areas instead of only opening them up when there's a scene to be seen.