polar_bear.json

{
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "minecraft:heart_of_the_sea",
          "conditions": [
            {
              "condition": "minecraft:random_chance",
              "chance": 0.33
            },
            {
              "condition": "minecraft:entity_properties",
              "entity": "this",
              "predicate": {
                "nbt": "{\"is_baby\":true, \"air\": 0s}"
              }
            },
            {
              "condition": "minecraft:damage_source_properties",
              "predicate": {
                "bypasses_armor": true,
                "bypasses_invulnerability": false,
                "bypasses_magic": false,
                "direct_entity": {}
              }
            },
            {
              "condition": "minecraft:alternative",
              "terms": [
                {
                  "condition": "minecraft:entity_properties",
                  "entity": "this",
                  "predicate": {}
                },
                {
                  "condition": "minecraft:location_check",
                  "predicate": {
                    "block": {
                      "block": "minecraft:water"
                    }
                  }
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}