breaking_block.json

{
    "forge_marker": 1,
    "defaults": {
        "model": "forge:multi-layer",
        "custom": {
            "base": "yourmod:breaking_block#base",
            "Solid": "yourmod:breaking_block#base",
            "Translucent": "yourmod:breaking_block#breaking"
        },
        "transform": "forge:default-block"
     },
    "variants": {
        "normal": [{}],
        "inventory": [{}],
        "base": [{
          "model": "cube_all",
          "textures": { "all": "yourmod:blocks/yourcube" }
        }],
        "breaking": [{
          "model": "cube_all",
          "textures": { "all": "destroy_stage_1" }
        }]
    }
}