minecraft-assets/data/minecraft/loot_tables/blocks/attached_pumpkin_stem.json

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1.0,
      "bonus_rolls": 0.0,
      "entries": [
        {
          "type": "minecraft:item",
          "functions": [
            {
              "function": "minecraft:set_count",
              "count": {
                "type": "minecraft:binomial",
                "n": 3.0,
                "p": 0.53333336
              },
              "add": false
            }
          ],
          "name": "minecraft:pumpkin_seeds"
        }
      ],
      "functions": [
        {
          "function": "minecraft:explosion_decay"
        }
      ]
    }
  ]
}