When you harvest lumber, and that you have a lumber mill, the harvester will sometimes prefer to bring wood to the lumber mill, even if it takes more time than going directly to the town hall. Moreover, if you have a lumber harvester from the goblin laboratory, and that you have a closed base with a lumber mill inside, and that the goblin is outside the base, the harvester will desesperatly try to bring the lumber to the mill, while he can't access it and just have to bring it to the town hall.
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