Damage Source Properties Condition not working

The damage_source_properties condition is not working in the loot table I have created. I want a specific drop to occur but if and only if the damage that kills a creeper is that of a tnt or a tnt_minecart. This is currently an item in the creeper pool. 
{
      "rolls" : 1.0,
      "entries" : [
        {
          "conditions" : [
            {
              "condition": "minecraft:damage_source_properties",
              "predicate" :{
                "direct_entity": {
                  "types" : [
                    {
                      "type" : "minecraft:tnt"
                    },
                    {
                      "type" : "minecraft:tnt_minecart"
                    }
                  ]
                }
              }
            },
            {
              "condition" : "minecraft:random_chance",
              "chance" : 1
            }
          ],
        "type" : "minecraft:item",
        "name" : "minecraft:music_disc_11",
        "functions" : [
          {
            "function" : "minecraft:set_nbt",
            "tag" : "{CustomModelData:5, HideFlags:32}"
          },
          {
            "function" : "minecraft:set_name",
            "name" : [
              {
                "text" : "Revenge",
                "color" : "red",
                "italic" : false
              }
            ]
          },
          {
            "function" : "set_lore",
            "lore" : [
              {
                "text" : "by CaptainSparklez",
                "color" : "white"
              }
          ]
          }
        ]
        }
      ] 
    }