Gray Alliance

Hello! I'm experiencing a bug on mission 3. As soon as I load the beginning of the mission, I choose one of the "gift" options (ring of elementals, "ring of cold" spell, money) at the start of the mission, and then click "start." The introductory cutscenes appear, and after them, the game begins, but not in the usual way; it immediately ends. That is, as soon as I start the game, the hero icon and the hero himself appear, and after a couple of seconds, the game automatically plays through, a cutscene appears with one of the Necromancers, who says something like "that's where you belong," then the defeat banner appears with a "close" button, and the game exits to the menu. Please advise what to do or provide a link to download a save file from the beginning of the game. Thank you in advance for your help!