Manual saving broken

Hey everyone,
I started a new story-run on hardcore mode on Xbox one and at first, everything was fine. I was able to save via drinking saviour snaps (or whatever it is called in English) and loading those slots still works. But since I started the quest where you go hunting with sir Hans capon, the game says “saving successful”, but when I try and load one of those saves it suddenly say’s “loading failed”. I have tried reinstalling and reinstalling the game but it didn’t do a thing. Is this some kind of bug that’s still not fixed two years after launch?