Hello. I came across an Issue which I can't seem to figure out alone. I'd like to play on a 1.19.3 Server with Beta Terrain combined with these immersive 1.19. caves. However I just don't know what I should go about it! Do I have to generate the world first in Single Player and then transfer over the save file to the server? I just don't understand how this works, also the menu slightly confuses me, all I see in the customize menu is a black background and some numbers...
I would very much appreciate some help here, thanks in advance!

Do you know how to do it in single player? I am struggling to find a solution to this.