JSON message is not unmarshalling correctly into protobuf message about webrisk HOT 1 OPEN

"error": {
    "code": 400,
    "message": "Invalid value at 'version_token' (TYPE_BYTES), Base64 decoding failed for \"\n\r\b\u0001\u0010\u0006\u0018\u0001\"\u00030010\u0001\u0010  \u0007\u001a\u0002\u0018\u0003 h 8\"",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "field": "version_token",
            "description": "Invalid value at 'version_token' (TYPE_BYTES), Base64 decoding failed for \"\n\r\b\u0001\u0010\u0006\u0018\u0001\"\u00030010\u0001\u0010  \u0007\u001a\u0002\u0018\u0003 h 8\""
          }
        ]
      }
    ]
  }