Auto-translated
Hmm... I don't think anyone submitted a save where the mission wasn't completed. I stumbled upon this developer error myself when playing for the first time (right after the official release). It reminds me of their bug with the bone dragons in the Necromancer mission.
I think I saw someone mention in the thread that their mission wouldn't end. I think such a save could be considered valid, but only if all the map conditions are met, namely:
1. The border has been crossed.
2. ALL fortresses have been captured.
3. All enemy heroes have been destroyed.
4. The monks in the circle have been destroyed.
It should be easy for the judge to check if these conditions are