Driver not mapping buttons for XP Pen Deco 03

[Norgus]

I'm using Garuda Linux (Arch linux with some extras) in X11 KDE and tried the release version and then the git version of this driver and the associated tablet driver utility. As far as I can tell, both versions respond in the same manner.

Both appear to recognise the tablet and pen position digitisation, 'click', pressure sensitivity, and the 2 pen button's default mappings all work,

However, none of the K1-K6 buttons do anything, and neither does the rotary scroller thing

This is the output from running the driver daemon, then opening the driver utility, refreshing the list, changing and saving the mapping trivially, and closing the utility.

userspace_tablet_driver_daemon
Listening on socket /home/norgus/.local/var/run/userspace_tablet_driver_daemon.sock
xp_pen_handler initialized
huion_handler initialized
Handling XP-Pen Deco 03
Setup completed on interface 0
Setup completed on interface 1
Device: XP-Pen Deco 03 - Probed maxWidth: (50800) maxHeight: (28575) resolution: (5080)
Attached to interface 2
Sending init key on endpont 3
Setup completed on interface 2
Set up config for device 150: (XP-Pen Deco 03)
Got new socket connection
Handling get connected devices request
Handling get connected devices request
Handling reload configuration request
Connection closed on socket

After this, I test the tablet with Krita, the pen digitisation works (including pressure variability) but the buttons and wheel do not respond. I open a text editor, press all of the buttons which are mapped to letters, no letters result.

Is there something I should be checking in my environment? Please ask for any details necessary for troubleshooting I have missed.