Works fine for me with the original Zwave multi button dth.
You have to get a little trick of the pulsations.
The simple press you have to press less than 1 sec and the green led will light up.
The multiple keystrokes have to be very fast and the green led also lights up if you do it correctly.
It has an error with an open ticket, that in automations all the actions followed are shown, without separating for each button.
Quick controls work fine. On Android.
I use it to enter a sequence and disable and enable STHM and it works fine.
you can practice as seen in this video and watch this thread.