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

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "conditions": [
            {
              "condition": "minecraft:block_state_property",
              "block": "minecraft:tnt",
              "properties": {
                "unstable": "false"
              }
            }
          ],
          "name": "minecraft:tnt"
        }
      ],
      "conditions": [
        {
          "condition": "minecraft:survives_explosion"
        }
      ]
    }
  ]
}