After making my way through the shadowlands and eventually getting to moonrise towers, I decided to go back to the last light inn. Upon getting there, there were a bunch of monsters, and the game plays the cut scene from after Isobel is kidnapped. The shield goes down, the NPCs turn hostile, etc. Okay. Except I already went through that plot point, saved Isobel from being kidnapped, and killed the traitor. I reload. I test some things out.
Every single plot point has been reset. I go back to Ethel's swamp area, and the enchantment is back up. The redcaps are alive again. I go to the emerald grove, and the entrance is blocked off by vines (I don't even know what that's about; is that the ritual the druids were gonna do before I convinced them not to?). Also, there's a goblin raid attacking the grove. So I go to the goblin camp. All the NPCs are alive again. I killed all of them ages ago, so that's weird. The Rosymorn Monastery is completely blocked off by some kind of cave-in; again, I never triggered this. I go to the gauntlet of shar. The dark tremors are back. Again. The vault that Balthazar and his team are in? Locked, and there's no cutscene this time to open it after I kill all of the hostile NPCs. Oh, and going through that battle while the NPCs in the vault try like 30 times to open the door... each... was an experience. I go to the basement of moonrise towers and for some reason there's a death Shepard and a bunch of undead NPCs. All hostile. Never even been in there before. I checked some earlier saves and they're similarly broken. Every time I go to a place I've already been, the NPCs are back alive and I have to redo things. The NPCs in Grimforge are back after I killed all of them, and the forge giant was released even though I never released him. So I can't even do that fight now. Nere is alive and stuck behind the rocks again.
Oh yeah, and a ton of NPCs I can't even talk to now. I can't tell the reasoning for why I can talk to some and not others, but I can't talk to Mig in moonrise, for example.
The game is completely unplayable. I have lost 50 hours of progress into my first-ever run of this game. At this point if I can't fix this I don't even want to play anymore. I have zero interest in searching through saves to find a playable one, only to have to then redo a bunch of things.