Came back to say that until there is a fix, this is probably the best solution-- it's fairly easy to do, it doesn't reset any interactions with NPC in terms of dialogue, butr does cover everything in fog of war again, restores any killed creatures and loot in crates/chests/etc.
This fix does not work as stated. Can someone clarify what missing steps there are? Do I need to re-zip my file? Delete the old save file?
I unzipped my savegame, deleted the files with Raedric, and then launched the game again. Loading my game did absolutely nothing different.
don't unzip, you need to do all from the program, without unzip, open que quicksave.savegame with 7zip and delete the files.
If you unzip is more complicate, is better if you do all from the program.