why is the sword with no custom model data a missing texture?

    "parent": "item/handheld",
    "textures": {
        "layer0": "item/gravitite_sword"
    },
    "overrides": [
        {"predicate": {"custom_model_data": 1}, "model": "aether:item/gravitite_sword/bladetongue"}
    ]
}

heres my gravitite_sword.json file