How To Make My Custom Flower Spawn In? (Bedrock Minecraft)

Question

So I am using this free addon maker (it is pretty bad) and I am trying to my flower spawn in. However, as far as I travel, I never see one. Here is the file:
{
  "format_version": "1.13.0",
  "minecraft:feature_rules": {
    "description": {
      "identifier": "overworld_underground_sepular_flower_feature",
      "places_feature": "pa_sepular_flower_feature"

},
        "conditions": {
          "placement_pass": "surface_pass",
          "minecraft:biome_filter": [
            {
              "any_of": [
                {
                  "test": "has_biome_tag",
                  "operator": "==",
                  "value": "flower_forest"
                },
                {
                  "test": "has_biome_tag",
                  "operator": "==",
                  "value": "plains"
                },
                {
                  "test": "has_biome_tag",
                  "operator": "==",
                  "value": "bee_habitat"
                }
              ]
            }
          ]
        },
        "distribution": {
          "iterations": 1,
          "coordinate_eval_order": "zyx",
          "x": 0,
          "y": "query.heightmap(variable.worldx, variable.worldz) + 1",
          "z": 0
        }
      }
    }

Here is proof I looked up the question and found no answer:

Please note my addon creator only allows the block to spawn on one type of block using the block filter, which won't work. E Edit: Bounty expiring soon! Answer fast!

aphid · Answer

You may have made a very rare object. It can only appear 1/256 of the time and only 2 tiles above one of the 256 surface tiles in each 16x16 chunk.
Try changing the 'distribution' to make your object more common. I've changed the following:

The iterations variable controls how often a thing spawns.
Setting the x and z coordinates to a distribution should allow the feature to spawn on more blocks in the chunk.
The query.heightmap() function already returns a y coordinate one above the landscape, so I've removed the '+1' (unless you want a hovering flower, then change it back).

The result of that is:
     "distribution": {
      "iterations": 10,
      "coordinate_eval_order": "xzy",
      "x": {
        "distribution": "uniform",
        "extent": [ 0, 16 ]
      },
      "y": "query.heightmap(variable.worldx, variable.worldz)",
      "z": {
        "distribution": "uniform",
        "extent": [ 0, 16 ]
      }
    }

See if this makes your object spawn more often.

You can use these resources to guide you further:

Guide to custom block distribution (this one's in Japanese): https://tokamcwin10.blog.jp/article-41591212
General bedrock modding features: https://minecraft.fandom.com/wiki/Bedrock_Edition_features_documentation
JSON schema for custom biomes: https://rinca-h.github.io/minecraft/other/biomeschema.html
Guide to custom biome generation: https://wiki.bedrock.dev/guide/custom-generation
Guide to moLang (used in various expressions in such files): https://bedrock.dev/docs/stable/MoLang

How To Make My Custom Flower Spawn In? (Bedrock Minecraft)

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