Hello, i have THIS when i try to play Orbiter 2016 any russian space program mission - clean installation of O2016 with only addons of Vostok and Soyuz.
The ground where the flame pit should be is an O2016 terrain thing with this addon, I'm afraid that's how it is. That pad thing shouldn't be there, though. I'm guessing you weren't able to get igel's surface tiles and O2016 patch?
No one has worked with an extensive detailed 3D mapping around Baikonur (or any other Russian spaceports) for Orbiter 2016+ yet afaik except for @igel on his Historical Spaceports addon. Unfortunately the files for Baikonur itself were lost when the new system for downloading Orbiter addons were implemented last year