Worldgen not working

[MatNX]

Hi. I have added a new ConfiguredFeature JSON, a new PlacedFeature JSON and a new BiomeModifier JSON, and in 1.20.4, those should be enough to generate my feature in the world. When I try to generate a world, however, I get this error:

ResourceKey[minecraft:root / minecraft:worldgen/configured_feature]: Unbound values in registry ResourceKey[minecraft:root / minecraft:worldgen/configured_feature]: [dungeons:disk_tumblestone]

Any idea what could cause this? For reference, this is my ConfiguredFeature:

{
  "type": "minecraft:disk",
  "config": {
    "state_provider": {
      "fallback": {
        "type": "minecraft:simple_state_provider",
        "state": {
          "Name": "dungeons:tumblestone"
        }
      },
      "rules": []
    },
    "target": {
      "type": "minecraft:matching_blocks",
      "blocks": [
        "minecraft:dirt",
        "minecraft:clay"
      ]
    },
    "radius": {
      "type": "minecraft:uniform",
      "min_inclusive": 2,
      "max_inclusive": 3
    },
    "half_height": 1
  }
}

This is my PlacedFeature:

{
  "feature": "dungeons:disk_tumblestone",
  "placement": [
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "OCEAN_FLOOR_WG"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:matching_fluids",
        "fluids": "minecraft:water"
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}

and this is my biome_modifier

{
  "type": "forge:add_features",
  "biomes": "#minecraft:is_overworld",
  "features": "dungeons:disk_tumblestone",
  "step": "surface_features"
}