[SOLVED] Custom Dimension Terrain Using 1.16.5's Custom Dimension JSON Format

Hello! I have an issue with a custom dimension.

I had made it a standard world at first, and I wanted it to be like the end after seeing how the "overworld theme" of the world was kinda bad....

Here is a screenshot:

Here is the code for the custom terrain I am trying to add:

{

  "type": "bpj:bpauroranplane",
  "generator": {
    "type": "minecraft:noise",
    "seed": 0,
    "settings": {
      "name": "minecraft:floating_islands",
      "bedrock_roof_position": -10,
      "bedrock_floor_position": -10,
      "sea_level": 0,
      "min_surface_level": 0,
      "disable_mob_generation": false,
      "noise_caves_enabled": true,
      "default_block": {
        "Name": "bpj:bpauroranstone"
      },
      "default_fluid": {
        "Name": "bpj:bpauroranterracotta"
        }
      },
      "noise": {
        "min_y": 0,
        "height": 256,
        "density_factor": 1,
        "density_offset": -0.46875,
        "size_horizontal": 2,
        "size_vertical": 1,
        "simplex_surface_noise": true,
        "random_density_offset": true,
        "island_noise_override": true,
        "noodle_caves_enabled": true,
          "aquifers_enabled": false,
          "deepslate_enabled": false,
        "ore_veins_enabled": false,
        "amplified": false,
        "sampling": {
          "xz_scale": 1,
          "y_scale": 1,
          "xz_factor": 160,
          "y_factor": 80
        },
        "bottom_slide": {
          "target": -30,
          "size": 0,
          "offset": 0
        },
        "top_slide": {
          "target": -10,
          "size": 3,
          "offset": 0
        }
      },
      "structures": {
        "structures": {
          "minecraft:buried_treasure": {
            "spacing": 10,
            "separation": 5,
            "salt": 0
          }
        }
      }
    },
    "biome_source": {
      "type": "minecraft:fixed",
      "biome": "bpj:bpauroranbiome"
    }
  }
}
 

I intend to keep the 1.17 features (aquifers, noodle caves) for the future. I wanted the world to look like the end, and it half-worked. Structures spawn, worldgen works, and other things spawn, but the stone isn't replaced by bpj:bpauroranstone.

^ This is my custom code for MCreator to use to generate the terrain for a custom dimension.

I wondered if there was anything I was doing wrong that would prevent the stone from changing to the block I wanted to be. Otherwise, none of the ores I have will spawn in the dimension, and the colors won't match.