I have three datapacks on my server that add extra biomes and a new dimension,
Heaven Dimension 1.16 | New Dimension + 2 Biomes
far-end-ender-expnasion-pack-1.1-v1.16.5-server | Additional Biomes for the end
Incendium_v3.1.10 | Additional Biomes for the nether
Trying to include these biomes and dimension in the betterspawner config does nothing, it functions as though nothing has been changed.
Pixlemon do not spawn in the new dimension or new biomes, but their regular spawn behavior is intact.
The datapacks do not add any new blocks.
Here is the pastebin for the betterspawnerconfig.json
https://pastebin.com/WhZ63idN