persistent resources after building deletion
I deleted the workshop, to make room for a magic shop, which in turn, made all the resources that were there before the workshop was placed, respawn again. The trees were choppable, but the stones were bugged and weren't minable.
Also, the stones stayed there through every stage of the new magic shop build, until it was completed. Even after we made the floor, the bugged stones could still be seen poking through it. It was only after the door was made, that they finally disappeared.