Schlage Door Lock in Ring but not in MQTT

I have a ZWave Schlage door lock that was connected to my Ring security system. The Ring is integrated with HA on RPI4 through MQTT.
Until a couple of weeks ago, everything was working fine. All the sudden the door lock is unavailable in Lovelace as well as in MQTT, while it works fine in the Ring App.
Reload of MQTT is not helping, reset of the door lock has had no effect.
Does anybody have an idea, where to start?

Here is my software stack:
Homeassistant: 2022.8.7
HA OS: 8.5
ZWave JS: 0.1.70
Mosquito Broker 6.1.3

Does anybody have an idea where to start searching for the root cause?
Thanks
Joe