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Moonst@r, but why didn't Remix have this bug then? He defeated Markel, and the mission was completed.
https://www.youtube.com/watch?v=H41OPiXexjk
Try removing third-party maps and mods. The cause of the bugs might be in them.
Do you know why the bug exists for me and other people? I don't. That's why I don't know why Remix doesn't have it. Besides me, two other people in this thread have the same problem (NikitaM and Allestrago), but the question is directed to me after two years, and not to those people who were trying to figure it out back then.
Version 3.1. I didn't use any alternative creature upgrade. The only mod I have adds specific numbers to the descriptions of city specializations. I removed it, but it didn't help.