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SYNC: Request ID 7814133750281608407 returned with empty JSON

See original GitHub issue

I am getting this error when i send JSON to SYNC Request via app.onSync((body, headers) => {}); This is the JSON Response which i am sending:

{
   "requestId":"7814133750281608407",
   "payload":{
      "agentUserId":"5b9c1a1b72d65025a8ca3f33",
      "devices":[
         {
            "id":"5b9c1a1b72d65025a8ca3f22",
            "type":"action.devices.types.OUTLET",
            "traits":[
               "action.devices.traits.OnOff"
            ],
            "name":{
               "defaultNames":[
                  "IR Switch"
               ],
               "name":"TV",
               "nicknames":[
                  "ir switch"
               ]
            },
            "attributes":{

            },
            "roomHint":"kitchen",
            "deviceInfo":{
               "manufacturer":"iRHub",
               "hwVersion":"1.0",
               "swVersion":"1.0",
               "model":"IR Device"
            },
            "willReportState":false
         },
         {
            "id":"5b9c1a1b72d65025a8ca3f88",
            "type":"action.devices.types.OUTLET",
            "traits":[
               "action.devices.traits.OnOff"
            ],
            "name":{
               "defaultNames":[
                  "IR Switch"
               ],
               "name":"AC Remote",
               "nicknames":[
                  "ir switch"
               ]
            },
            "deviceInfo":{
               "manufacturer":"iRHub",
               "hwVersion":"1.0",
               "swVersion":"1.0",
               "model":"IR Device"
            },
            "willReportState":false
         }
      ]
   }
}

The Error SYNC: Request ID 7814133750281608407 returned with empty JSON is coming on Google Cloud Logs Viewer. Just after Account Linking completes, google assistant sends RequestSync to Cloud API, This ‘empty json error’ is encountered and then account linking fails.