Describe the bug:
Using KubeJS, I added some modded biomes to this mods biome tags, but it seems like the behavior I expected from the wiki isn't really applying to any modded biomes I've tested in. It seems to work fine in vanilla biomes though.

The conditions are also seemingly right; as far as I can see, the configured features replace generic block tags like minecraft:dirt, so this doesn't seem to be an error on my end where I'm using this incorrectly

Versions:
Minecraft version: 1.18.2
Immersive Weathering version: 3.0.3
Moonlight Lib version: 1.17.9
Forge version: 40.2.0

Other mods:
modlist

Logs:
latest.log directly after creating a new world

Expected behavior:
Appropriate configured features spawning in tagged biomes

Screenshots:
The tags are being applied correctly:

Additional info:
here is my script: (again, very likely not an issue with KubeJS)

onEvent('tags.worldgen.biome', event => {
    // does not work
    event.add('immersive_weathering:has_fluvisol', [
        'regions_unexplored:bayou',
        'regions_unexplored:giant_bayou',
        'atmospheric:rainforest_basin'
    ])

    // does not work
    event.add('immersive_weathering:has_humus', 'regions_unexplored:blackwood_forest')

    // does not work
    event.add('immersive_weathering:has_ivy', [
        'regions_unexplored:deciduous_forest',
    ])

    // does not work
    event.add('immersive_weathering:has_vertisol', [
        'regions_unexplored:saguaro_desert',
        'atmospheric:flourishing_dunes',
        'atmospheric:dunes'
    ])

     // works fine
    event.remove('immersive_weathering:underground_desert', 'minecraft:desert')
})

seems be to due to a mistake on my part, sorry