The top picture was made on an older version of the game. Since 0.6.0.0 (I think), it shows the layout without any details of what's inside the room. No way to get around it as far as I know.
In case you wish to have this on your own game - but don't mind the idea that other players playing with you can see the background walls still, I released the mod below that you can use to replace your los shader: