Spawning above ground with map over 6000

Hello, I currently have massive problems with the map. Which is apparently somehow not generated correctly.
I wanted to take advantage of the recent forced Wipe to enlarge my map and went on the maximum size of the world 8000.
Now I have the problem that does not recognize the full game the floor. I have no sound when walking.
If I want to add something with my copy/paste Plungin he says that he finds no entity. My Portgun not recognize
more where I look. The Rad Towns are partly underground. The know everything suggests that something is wrong with the map.
Have already tried 3 different seeds and i deleted the old map each time before using FTP completely but always the same result.
I also Spawn no more on the beach as usual every time you re-spawns. I spawn about 500 feet in the air and fall down at the wake.
I will survive only through my Godmode.
Does anybody advice ???

 

=> facepunch for garry to see.

 

ok i postet it in the Facepunch Forum.