advancement not working (player_killed_entity)

I recently saw a video of how to make an advancement like this and mine has the condition of kill a zombie, but it doesnt work. I tried to grant me the custom advancement but, guess what, I doesnt appear🙁
data//advancments/test/root.json:
    "disaplay":
    {
        "icon":
        {
            "item": "zombie_head",
            "nbt": "{Enchantments:[{lvl:1s, id:\"minecraft:mending\"}]}"
        },
        "title":
        {
            "text": "Conqueror of the Canibbal"
        },
        "description":
        {
            "text": "Kill a caniball"
        },
        "frame": "task",
        "show_toast": true,
        "announce_to_chat": true,
        "hidden": false,
        "background": "minecraft:textures/block/moss_block.png"
    },
    "criteria": 
    {
        "killed_zombie":
        {
            "trigger": "minecraft:player_killed_entity",
            "conditions": 
            {
              "entity": 
              {
                "type": "minecraft:zombie"
              },
              "killing_blow": {}
          }
        },
        "requirements": 
        [
          ["killed_zombie"]
        ],
        "rewards": 
        {
          "experience": 3
        }
    }
}```