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First case: I'm doing a quest with peasants, and to interact with them, I have to attack them. A dialogue box pops up, and no matter what I choose, I end up fighting them (if I choose to attack, I have to fight 3 battles), and nothing is registered. Something similar happened on a map by dyrman; instead of being able to peacefully buy a Necropolis, I had to kill 4,000 Astral Dragons.
Second case: in a place where there's a queue to see the mentor, I also killed a peasant, and after the dialogues, wolves appeared, and the game stopped responding to anything, but the music and animations were still running.
P.s. After I captured a mine that was supposed to be teeming with undead, I decided to reinstall the game.