You have same engine error as I do. What have you tried? Have you tried removing all place item orders? I have this idea, that when Hearthling has an order to place item in world, and somehow this item gets bugged in his inventory, he cannot place it, item will probably show twice in your Town overview/Town inventory, and because he cannot place it, and his item is marked for placing, he stands idle, because AI don’t know what to do.