Just after the battle with The Weasel I saved and quit the game. Later on I tried to load that save and got this:
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The autosave was fine, but it was made before that battle. I’m not sure if I saved before the dialog-window-event-thing that happens in the end of this battle.
Oh, this happened on my first game after the small update early today.
Okay, after some experimentation using that autosave I was able to reproduce the bug. It really happens if you save the game before that “After the battle” window appears and try to load it. (you get that window as soon as the game resumes after the battle).