Jack_of_shadows
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The funniest part about all this was that the bug turned out to be the very one that had been found a while ago: I needed to place campfires in one location from time to time, with their properties turned off, purely as an interior design element. At first, I placed them in a secluded spot in the dungeon and, when the time came, moved them to the surface. This caused the surrounding landscape from the dungeon to appear. Then I came up with a more clever solution: I placed them on the surface, but on the first turn, I moved them to a secluded spot in the dungeon and continued from there. It seemed like the bug had disappeared, but after a long time, thanks to the chasms, it turned out that the campfires had indeed dragged the upper landscape with them into the dungeon.