FYI, the map is made up of 2 isosceles triangles paired as squares.
re-logging didn’t fix, nor quitting and restarting the game.
Might need to verify your games files. THat is a really odd error.
No joy,
So far tried validation of files, change of resolution, change of graphics settings, switching servers, switching to solo…
Oh wait I got the fix…
Switching the new things I did, Set graphics to ultra, then to high then set TSR resolution Quality to Native AA…
No idea what the trigger was, but it worked.