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I experimented a bit. It turned out to be another joke by the developers. A previously unexplored corner of the dungeon was revealed. The minimap showed a second exit. In reality, it was a shaft. After breaking through it, the exit disappeared from the minimap. But the main exit reappeared.
valleriv, I'm not planning on replaying it again just yet. Right now, I'm playing through it with a different hero because the first time I played it, I used a Warrior. I'll finish this campaign, and then I'll play through others. I downloaded three fan-made campaigns from Google. On the Nival forum, they say that "Year of the Fiery Tears" is even difficult to complete on Recruit difficulty.