What had happened?

Been on a server with some friends for a bit now; a few of the alexcaves biomes just do not seem to be generating. Primordial Generated, Candy, Abyssal Chasm, Toxic caves but the others just are not. Any reason why?
Modpack - https://www.curseforge.com/minecraft/modpacks/jojos-bizarre-pack
Seed - 6936028169580692804

Minecraft Version

1.20.1

Alex's Cave Version

2.0.2

Citadel Version

2.6.2

Game Log / Crash Report

No response

Check List

• I have removed Optifine.
• I have installed other mods (Please also provide mod list)
• This is a conflict with other mods and no issue occurred when running standalone.