Yesterday my inventor woke up to 5 of his gnomes returned, regular and inventor types. The next night, while sleeping, there was a loud THUNK and a troglodyte appeared, and some gnome turned on loud music on both the top and bottom floors, waking up everyone in the household. While I'm not sure that's all the gnomes that went missing, it's interesting to note that some were there when first playing the household after the patch, and at least one appeared the next night.