minecraft-assets/assets/minecraft/blockstates/chorus_flower.json

{
  "variants": {
    "age=0": {
      "model": "minecraft:block/chorus_flower"
    },
    "age=1": {
      "model": "minecraft:block/chorus_flower"
    },
    "age=2": {
      "model": "minecraft:block/chorus_flower"
    },
    "age=3": {
      "model": "minecraft:block/chorus_flower"
    },
    "age=4": {
      "model": "minecraft:block/chorus_flower"
    },
    "age=5": {
      "model": "minecraft:block/chorus_flower_dead"
    }
  }
}