Kortez_Koordinal
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This is game over. Unfortunately, your save files are irrevocably corrupted! (You can believe me). Start a new game (after deleting all the corrupted save files); the mods are not the cause here.
Damn, the saves just got corrupted specifically in this campaign; all other saves are fine :(
Okay, thanks for the answer! Do you have any guesses as to what might be causing this issue?