^ Exactly this.
Mods add extra data, and the game needs to account for it when it saves. If the game is supposed to say:
1 + 2 = 3
...a mod will say something like:
1 + 2 (+ MOD 4) = (MOD 7)
It overrides the default functionality. Essentially, "3" no longer exists. If I save the game with that mod running, the reference to "MOD 4" and "MOD 7" will be saved along with the rest of the data. If I later remove the mod, it may put that saved game into a state where it says:
1 + 2 (+ MOD something???) = (...not 3???)
That sort of error is now baked into the save state of the game. There's no way for the game to know that the data for "MOD 4" and "MOD 7" no longer exists, and that can result in errors. Sometimes, it will be fine: the game will just default back to its original state. Other times, the extra command will remain, but it's now "empty". That can result in nothing noticeable, weird glitches, or outright crashing. All depends on exactly what the mod does and how it was written.
Hence, beginning a new game with no mods at all is the only way to test whether the problem exists in vanilla.
_______________
If the problem occurs in that brand new playthrough, we can confirm it's a vanilla bug and report it to Support.
If everything seems to be working in vanilla, we can be fairly confident that missing reference data is the cause of the blank scans. When any problem exists in a modded save file, there's nothing that Support can do. The studio can't account for the virtually endless mod combinations that may be creating issues. Modding is always done at the player's own risk.
Also, it doesn't mean your old save is toasted. If it is a mod issue, you may be able to figure out which mod might have caused it and just download the latest version of it. That very well can replace the missing reference data and everything may start working again. (But we'd need to figure out which mod was likely causing it.)
One thing at a time, though. Maybe we'll find it does occur in vanilla, and then you're good to restore the saved games.