Steps To Reproduce:
I first saw this from Ornsnabben Lookout Point (first two screenshots), looking generally toward Masskar Radar Tower. I went to Masskar Radar Tower and see it again toward Grantrop(?), (third and fourth screenshots).
Yeah, I’ve seen that happen in several different locations so far. It’s a rendering bug, not a floating structure. That’s the top of a communication tower. the top of the mast is being drawn in at a farther distance than the tower itself, when in reality they should be rendered at the same distances. If you get closer to it, you’ll see the tower finally render in.
It’s definitely a bug though, just not quite what you thought it was.