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I've just had this happen in 0.47.05 with natural obsidian walls formed by pouring magma into a flooded cavern.
The cavern had 2 z-levels of water in some places, so the top layer was turned into obsidian while the bottom layer was still water. Cutting down one of the trees left the obsidian floor intact, but removed a circular section of obsidian walls below and even left a hole in the water on the bottom layer. There's a single tile of dry gneiss cavern floor surrounded by 7/7 water on all sides.
I'm guessing that trees claim a volume of tiles when they grow, and then when they're cut down they just delete anything inside that volume without checking whether it's part of the tree or not. |
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