[MC-187357] Strongholds will not generate in floating

All other structures seem to generate as normal. I generated a world with the settings below and used /locate to find a stronghold and none were found. I have seen temples, mansions, villages, etc. but no strongholds.

 {
  "generate_features": true,
  "bonus_chest": false,
  "seed": -1464245863,
  "dimensions": {
    "minecraft:overworld": {
      "generator": {
        "type": "minecraft:noise",
        "seed": -1464245863,
        "biome_source": {
          "type": "minecraft:vanilla_layered",
          "seed": -1464245863,
          "large_biomes": false
        },
        "settings": "minecraft:floating_islands"
      },
      "type": "minecraft:overworld"
    },
    "minecraft:the_nether": {
      "generator": {
        "type": "minecraft:noise",
        "seed": -1464245863,
        "biome_source": {
          "type": "minecraft:multi_noise",
          "seed": -1464245863,
          "preset": "minecraft:nether"
        },
        "settings": "minecraft:nether"
      },
      "type": "minecraft:the_nether"
    },
    "minecraft:the_end": {
      "generator": {
        "type": "minecraft:noise",
        "seed": -1464245863,
        "biome_source": {
          "type": "minecraft:the_end",
          "seed": -1464245863
        },
        "settings": "minecraft:end"
      },
      "type": "minecraft:the_end"
    }
  }
}

Strongholds will not generate in floating_islands or caves preset