@Andreas_Hegenberg, this did work fine for me for about a month now.
But it stopped working by the end of last week.
I can still use the Open Stream Deck Group with Name action to open the group but in this group (which is disabled to trigger it only via the widget) all buttons aren't working.
They look like they did before but they aren't doing anything - not even the default close group button.
If I enable this group it works all fine.
Also in the BTT UI these buttons are greyed out like disabled buttons but they don't have the "hidden" icon (eye).
I have the latest version (4.145) installed.