the weight is set to 1 and i have a lot of other biomes, but really, these biomes are huge and that's the most common biome in my worlds...

I'll look into the solution about ability to make biome much rarer than you can set now. I think it's more TerraBlender biome weight issue however I'll try to find a way to do this.

@Chuunkyz
Just pushed an update for Magical Forest, try out 2.0.2 and check if the issue still persists, biome placement should be much better I believe. I'll still make this issue open before someone confirms, that Magical Forest looks fine for players and not so common as it was in 1.18.1 builds.