New threat.

In the new version (lite), the peasant's quest involving zombies doesn't work (50%, 2 groups - at the customer's location, a quarry and a greedy merchant - they start the battle as standard neutrals). Consequently, after defeating all 4 groups, the quest isn't completed...

Yes, I figured out what was wrong; it was another incredibly silly reason. Thank you very much for pointing it out.
All it took was slightly shifting the region, and suddenly the quest stopped working. The hero reaches the zombies faster than the trigger activates. I was only testing the new features. But now everything should be fine because I haven't changed anything else...