minecraft-assets/assets/minecraft/blockstates/bedrock.json

{
    "variants": {
        "": [
            { "model": "block/bedrock" },
            { "model": "block/bedrock_mirrored" },
            { "model": "block/bedrock", "y": 180 },
            { "model": "block/bedrock_mirrored", "y": 180 }
        ]
    }
}