Issues with Zigbee2Mqtt Home Assistant Automatic Discovered Items

  • Platform information:
    • Hardware: RPi3
    • OS: Openhabian
    • openHAB version: OH 3

I’m trying to setup a new installation of OH3 and wanted to use the Hom Assistant Automatic Discovered items from my Zigbee2Mqtt instance.
After setting up a Thing + Channel + Item I’m stuck that the Item is still NULL even if a new value is reported. F.e. I get a new Temperature value via MQTT but the Item is still NULL afterwards. If I setup a Generic MQTT item with JSONPATH transformation everything works as expected. Do I miss something here as I would expect that OH3 can read the values correctly if it can auto discovery it ?