Help needed - Openhab, DeCONZ and Aqara Relay LLKZMK11LM

I have a strange issue where i currently have no idea where the problem comes from and where to start troubleshooting.

Currently i paired a new Aqara LLKZMK11LM relay switch with my Deconz Adapter and it was in my eyes properly detected:
“etag”: “2a06545387de9d4f1507a7d06b10fe97”,
“hascolor”: false,
“lastannounced”: null,
“lastseen”: “2020-11-28T09:53Z”,
“manufacturername”: “LUMI”,
“modelid”: “lumi.relay.c2acn01”,
“name”: “Garten_Treppe”,
“state”: {
“alert”: “none”,
“on”: true,
“reachable”: true
“swversion”: “02-27-2019”,
“type”: “Dimmable light”,
“uniqueid”: “00:15:8d:00:04:26:fb:87-01”

Added it through the HUE Bridge Emulation as a thing to OpenHab and configured this item:
Switch Garten_Treppe_Licht “Garten Treppenlicht” {channel=“hue:0100:00212E055495:19:brightness”}

so far so good, now my problem:
When i switch it on via OPENHAB the lights turn on and i see this in openhab.log
2020-11-28 10:58:39.819 [ome.event.ItemCommandEvent] - Item ‘Garten_Treppe_Licht’ received command ON
2020-11-28 10:58:39.826 [nt.ItemStatePredictedEvent] - Garten_Treppe_Licht predicted to become ON
2020-11-28 10:58:39.840 [vent.ItemStateChangedEvent] - Garten_Treppe_Licht changed from OFF to ON

After 5-10 secs OPENHAB automatically reports that the light has turn off and this entry in log is written

2020-11-28 10:58:47.302 [vent.ItemStateChangedEvent] - Garten_Treppe_Licht changed from ON to OFF

In fact the lights are still turned on, PhosCon also reports that light are on - just Openhab thinks the lights are off.

Any idea?

  • Platform information:
    • Hardware: PI4 4GB with DeConz Adapter 2.05.88 / 15.10.2020
    • OS: Buster
    • openHAB version: 2.5.10

nobody with same issue?
let me try to delete them from Openhab and readd it again