For a texture, I want it to interpolate, but it won't.

mcmeta:

{
    "animation" : {
        "frametime": 2,
        "interpolate": true,
        "frames": [
            0,
            1,
            2,
            3,
            4
        ]
    }
}

For the image file: https://github.com/TheElementGuy/Greek-Myths-Mod/blob/main/src/main/resources/assets/greekmyths/textures/item/stygian_iron_ingot.png.mcmeta

Does anyone know?

What does the texture look like in game?