hmm… i’m guessing the items that aren’t placed on the building itself just get considered as normal placements, so if you craft those chairs they’ll probably start getting placed… it’s an odd behavior, but i’m not sure if it’s really a bug… paging @sdee!
It is a bug, because you can’t easily remove them (they are still considered part of the building). Although if you have those items, hearthlings will eventually place them, as @8BitCrab says, and you can then undeploy them. This is an old issue actually.