Temporal paradox.

I was playing as a hero, and I got about 4 months into the game, but I didn't finish it. After unlocking and taking the second garrison of brown units, it says that the quest is not completed, and the game freezes. And there are only two quests left: to defeat Tolgar and capture his castle. In general, it's some kind of mess, or is it just me? Overall, I liked the map (the scenario, the balance of power). True, the main character is not very impressive. When developing, I focused on dark magic, and luckily there is a mentor and alchemists (by the way, one of them in the Dungeon is inaccessible). Before the game freezes, the computer says that my hero is stronger than the enemy. And also, I had some trouble finding the runes; it would have been nice to have a hint.

Added 23 minutes later
Replaying the battle with the garrison doesn't help, but increasing the AI speed does. But then Tolgar runs away, which means the quest fails, and in Tor-Hralle, there is a strong Kari with dwarven armor and immunity to Dark magic, who is impossible to defeat. In general, it's not getting any easier.