Xiaomi Plug ZNCZ02LM don´t work as Router

Hello,
I tried to extend the mesh by connecting several Xiaomi plugs ZNCZ02LM. Unfortunately they are not connected as routers. Does anyone have any idea why?

{ 
     "ieeeAddr":"0x00158d00030ac039",
     "type":"EndDevice",
     "networkAddress":36306,
     "model":"ZNCZ02LM",
     "friendly_name":"0x00158d00030ac039",
     "manufacturerID":4151,
     "manufacturerName":"LUMI",
     "powerSource":"Battery",
     "modelID":"lumi.plug",
     "dateCode":"09-04-2018",
     "lastSeen":1574009269867
  },
{ 
     "ieeeAddr":"0x00158d00039e2dc7",
     "type":"EndDevice",
     "networkAddress":5311,
     "model":"ZNCZ02LM",
     "friendly_name":"0x00158d00039e2dc7",
     "manufacturerID":4151,
     "manufacturerName":"LUMI",
     "powerSource":"Battery",
     "modelID":"lumi.plug",
     "dateCode":"09-04-2018",
     "lastSeen":1574009244482
  },

an Osram plug works, however

{ 
     "ieeeAddr":"0x84182600000b6181",
     "type":"Router",
     "networkAddress":14535,
     "model":"AB3257001NJ",
     "friendly_name":"0x84182600000b6181",
     "manufacturerID":48042,
     "manufacturerName":"OSRAM",
     "powerSource":"Mains (single phase)",
     "modelID":"Plug 01",
     "hardwareVersion":1,
     "softwareBuildID":"V1.04.12",
     "dateCode":"20140331DEOS****",
     "lastSeen":1574009209141
  },

Version:

"version":"1.6.0",
"commit":"34166a5",
"coordinator":{ 
   "type":"zStack12",
  "meta":{ 
     "transportrev":2,
     "product":0,
     "majorrel":2,
     "minorrel":6,
     "maintrel":3,
     "revision":20190619