Nobuildzones do not work. Buildings can be moved over the assumed nobuildzone.

See this I have many other examples.

Is it still actual?

Mr-Snake, 

Still there, but not on the basic area.
This screenshot of expansion

http://prntscr.com/mleeho

I think I know where is the problem. When you move a building at the edge of the screen, the area is automatically expanded.
Background is replicated, but the nobuildzones are not applied for the expanded area.

http://prntscr.com/mlekh5


http://prntscr.com/mlela1 !!!!

I think it's not quite that simple - I'm not only experiencing the same glitch allowing buildings to be placed over nobuildzones in some places, but there are also sections of my planet's build screen without nobuildzones which are acting like there are nobuildzones present anyway.  Maybe the nobuildzones are being shifted out of sync with the graphics rather than just being nonexistent?

https://imgur.com/a/YpiuAwC

Furthermore, I've verified that - to a small extent at least - building over nobuildzones can happen even in the original/unextended part of the build screen at the very top left corner (confirmed via presence of the builderbot in rotated idle pose), although this is still on a planet where my build screen has been extended both eastward and southward...

https://imgur.com/a/SrK427e

Fixed