Biome bundle world

I installed Biome Bundle (and OTG) on my Forge server. I couldn't generate a Biome Bundle world in the Aternos world tab, so I created one in the singleplayer mode and set it so it pregenerated some chunks. When I uploaded it to Aternos, the pregenerated chunks were fine but when I created more chunks by moving around the chunks were default Minecraft world generation.

I can't get it to make Biome Bundle chunks, can someone help me?

Just a question, what would a modpack do to make it work?

Thank you, it worked!

For anyone wondering, I've installed the modpack:" nature's beauty" and the world name changed.