Biomes o' plenty not working

I started a survival world on a modpack called Slightly Vanilla Flavoured on 1.16.5 and it has biomes o plenty installed on the newest version and when i changed the world type from DEFAULT to biomesoplenty and when i generated the world it I didnt see any biomes o plenty biomes i tried again 2 times and it still didnt work. Here is the server log: https://mclo.gs/LiddQul

i did that already and it didnt work

i restarted the server once again and it worked