We have long made sure that the player does not have to go through quests again. Use "New Game +" and skip those quests you've completed. Don't use old saves. The game will crash. In the new versions of the game, we specifically prohibited players from loading old saves, because loading such a save causes bugs. Why is this happening? The fact is that in the old version of the game, the mechanics that are in the new version of the game were not introduced. Due to an old save, they do not load correctly. Therefore, never, you hear, never use old saves. At least until we make an official statement that it is possible to use old saves without any problems. This is an engine problem.