tcc/servers/bedrock/behavior_packs/vanilla/items/pumpkin_seeds.json

{
  "format_version": "1.10",
  "minecraft:item": {
    "description": {
      "identifier": "minecraft:pumpkin_seeds"
    },

    "components": {
      "minecraft:seed": {
        "crop_result": "pumpkin_stem"
      }
    }
  }
}