Then explain that blonde guy sleeping in the house of the mc after coming home with the mom?
you are basically teasing it in the last update cliffhanger.
And the anti-cheating you must know what it is because you added the code yourself, if someone edits the save the game doesn't allow the player to continue with that save.
I can't be sure, but you've probably faced with the new security system in Ren'Py that prevents players from loading potentially harmful save files: https://github.com/renpy/renpy/issues/4879