Update:
I found an earlier timeslot and tried the command and a longer shutdown. Then powered on the devices in the first room and watched deconz. The first light now reacts again to group and scene xommands, however the first Busch-Jäger LightLink switch does not connect. After that I tried the devices in the next room and none of these (Hue Lights and Busch-Jäger LightLink switches) is able to establish a connection. Only my Illuminize window covers somehow are able to connect across the whole flat.
To me it seems that those Busch-Jäger’s are the culprit, as powering them on seem to stop the network Routing (but no 0xD2 errors right now). However, they worked for a long time with deconz. Are there any recent changes in the deconz versions from deconz onwards 2.23 concerning those switches?
In another thread with similar Problems another user also has Busch-Jäger in his Network:
https://forum.phoscon.de/t/scenes-and-groups-not-working-anymore/