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

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