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In the fourth mission, there's a typo in the cutscene when Tenedre transfers Aeron to the Town Entrance. There, Liana talks about her father and says something like "...he won't get to us (instead of won't get to me)..."
In the fifth mission, there are serious bugs:
When choosing a bonus spell, the spell to summon a town from the campaign, specifically the spell for the mage Zehir, is selected. However, this spell doesn't appear in anyone's spellbook. As a result, only Aeron, Liana, and Ingir are transferred to the fifth mission with their accumulated levels. Starting the final campaign from scratch, and naturally, the weak Ingir is defeated by the first gnome, around the end of the first week. If not, the campaign will have to be lost after 2 months because he won't kill anyone. This prevents completing the campaign; I can provide a save file.
By the way, it would be highly desirable to display a message or a mini-cutscene indicating that only Liana can visit the tent, as it's not certain that the player will lead her there instead of any other hero. Which is exactly what happened...