[Lou][2.0.43] Ghost landfill placed on top of actual landfill

[GreenScripter]

Placing lots of structures on water, I deconstructed them all including the landfill with undo, moved them slightly and placed them back down in an overlapping configuration. I can reproduce it by placing some landfill, marking it for deconstruction, and then shift placing a structure back on top of the landfill that is marked for deconstruction. The marked landfill gets unmarked, but a blueprint layer of landfill is also placed. This also causes construction bots to get stuck attempting to place the second landfill over the first.