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9ed4771515
When a new mapblock is generated and the mod checks the neighbors around a target to place a fallen twig, if it finds an unknown node (because it's in a neighboring, old mapblock from a previous session -- perhaps an old moss node that hadn't converted-over to wallmounted yet), trying to check its buildable_to state will fail, since that requires that there be a node def to look at, which an unknown node wouldn't have. This substitutes a known not-buildable_to node for those cases, so that the code won't try to overwrite what it found.