I’m not playing starfield, so I’m unsure of the save file structure. Just some troubleshooting ideas:
Do you have multiple saves for your original character and all those saves exhibit this behavior? If so, are any of those saves old enough that you know the issue wasn’t occurring already when you made the save? If both are yes, that seems very concerning, indicating that all that character’s saves became corrupted at the same time.
Does the game only allow you to have one save per character? If that’s the case, also very troubling, since you aren’t able to have saved to fall back on.
Does the game allow you to make multiple saves, but you’ve been saving over the top of your one save? If so, that sucks. Saves shouldn’t corrupt. in the future (in all games that allow it), keep some older saves in case corruption happens.