I just updated to OpenHab 2.5.4. As per the documentation I removed all my Z-Wave Things and re-added them. Now, I can no longer control my “ZMNHDD Flush Dimmer Plus” through OpenHab. However, when turning on or off the light with the physical switch on the wall, I do get an update in OpenHab. (Through all UIs and even the HomeKit integration.) But switching from OpenHab is not possible.
I could not find anyone with this problem (usually its the other way around.) I hope this isn’t a duplicate question.