serverconfig.json overrrided after game launched

[Wahazar]

I'm changing some worldgen parameters in serverconfig.json, but they are ignored and standard values are set to the new singleplayer map, and serverconfig.json is overwritten with standard values again.

Is it possible to keep custom values?

I know that I can set it by /worldconfig in game console, but I want to have this settings before map is generated around the spawn.

[Wahazar]

In other words, despite of values edited in serverconfig.json, default values appear in game start customize menu. If these are changed in customize menu, they are written in serverconfig. But  when game is relaunched, default values appear again.