prehistoric fauna world generation

i dont know if this is supposed to happen or not but when i try loading a prehistoric fauna world in the world type bar on the world section in aternos it pops up as a vanilla world when i try to play it i tested it, it only works in singleplayer can someone explain this to me im confused sorry

version:1.16.5

thanks

thanks for the answer yea i tried but my pc cant load a lot of the world and when i publish a saved file to aternos it kinda breaks thats what usually happens when i try with terraforged or something