MC version: 1.12.2 forge:14.23.5.2860
More planets version: More-Planets-1.12.2-2.3.3-GC4.0.6
Galacticraft version: Galacticraft-1.12.2-4.0.6
I'm trying to set asteroids as starting dimmension but it refuses to do it.
Setting Survival Planet Dimension Name to planet.asteroids is not changing anything.

Do you try to set a config before starting a server or did you just change it in-game?

I will reopen this later if you cannot setting up survival planet feature. You may need to try on new 2.4.0 release.