This has been solved with the current release of Hubitat, which includes a proper driver for the Qubino DIN Dimmer.
EDIT:
I just want to add that the issues were indeed not solved; as you can see in my other threads it kept coming back again and again...
But I'm happy(?) to report that the underlying problem has been found; Hubitat are using older and buggy firmware for their EU Z-Wave sticks, and very likely for the EU C-7 as well. Some more details here.
