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I have the following situation (version 1.0, seems to be a licensed version since there were no glitches before).
I completed this mission without any problems and, as suggested, I watched where the Necropolis attacks and ran there. After a month, Biara said "cuckoo." Everything was as it should be.
Then I completed the second mission and realized that I had leveled up incorrectly. I decided to replay from the first mission. And that's when the glitches started - the Necropolis doesn't attack for almost a whole month, and when it does, its army consists of humans (Haven) instead of undead.
And Biara doesn't come after a month or more.
And what should I do?
Added after 13 hours 27 minutes
In general, it was resolved by restarting the game and starting the mission again.
But I encountered such a glaring problem - in my hero's skill progression, there's this stupid "Tactics" skill, and it shouldn't be recommended for leveling up. So, how do I level up my hero now if one skill slot is occupied by this useless "Tactics"?