I can send a link to the save in google drive. Would you like that? As for the error, there's none. It just doesn't show Ochoko at the convenience store, and she stays at the school gates in the afternoon. Additionally, I made a new game and everything worked.
But I didn't change my name...
Another thing to note is that there's an error if you haven't completed ochako's route, after she joins your party, with Tsuyu, you'll get an error if you try to head into the cave. You have to complete it as much as you can first.
One last thing: Are you going to make a discord for this?