Glitches are a part of every video game, due engine faults or programming oversights and JoJo's Bizarre Adventure: 7th Stand User is no exception. Here's a list of glitches and how to solve them in the case of the game breaking glitches.
Requirements: Josuke route, Have King Crimson
In Japan, if you have skipped through the events regarding Holly's condition, there is a glitch where it would not show the snowy map, but instead the map where the original protagonist is on. This would result in the Snowy Road event being unavailable, so be careful.
In order to avoid this glitch, just don't skip the events.
Note: This glitch was fixed in KKM's fix for version 2.5.3.
D'Arby the Player Glitch
Requirements: Dio's Manor, split up with Joseph, Jotaro and Kakyoin.
There is currently a glitch in which the F-MEGA mini game that the dash button will not respond, resulting in the F-MEGA mini game being unwinnable.
Death 13 Glitch
Requirements: New Game+, Have King Crimson, Believe in Kakyoin's story, defeat Death 13.
If you have skipped through the events and got to the battle with Death 13 alongside Kakyoin, there is a glitch in which the event that happens before the Death 13 battle starts after the battle. This only occurs if you have King Crimson with you and skipped that event. This will cause a crash in the game.
In order to avoid this glitch, just don't skip the event before the Death 13 battle.
Requirements: In Jotaro's route, joined Jotaro in the first fight against DIO, lose the battle.
If you fought Dio alongside Jotaro in the first opportunity you have and lose the battle, a glitch will occur in which the protagonist's sprite will appear in every cutscene before the second battle against DIO and once that battle happens, a Game Over will instantly occur.
In order to correct this glitch, the player has to edit the save file. This can be done with a Hex editor or through more simple means utilizing this save editor and choosing to Restore All, which will lead you to the battle against DIO with full health.