If you have NRaas MasterController and MC Cheats in play, click on the ground of the lot and NRaas > MC > Object Stats > Non-Inventory and select to flush everything that has the word "jig" in the name.
Alternatively, or if that doesn't work, retreat to Edit Town, evict everyone to the side of the screen, copy the residential lot down to the bin, bulldoze the original, replace it, and move everyone back in without having left the screen (note that promised wishes and opportunities in progress will be lost that way). Stuck jig objects, which are usually invisible, cannot survive that kind of reset.