Roccat Ryos MK M-keys suddenly not recognised

I applied the most recent official updates yesterday morning, and after reboot the M- and T-keys on my Ryos MK keyboard no longer function. I have the roccat packages installed.

After looking at /dev/hidraw* I see that no files have a group name of roccat. All are showing root. My user is still a member of the roccat group.
The file 90-roccat-ryosmk.rules is in the correct place in the /usr/lib/udev/rules.d directory and the process /usr/bin/roccateventhandler is running as expected.

I have tried running udevadm control --reload-rules and udevadm trigger, but nothing changes. If I chown root:roccat hidraw3, then I can run roccatryosmkconfig and see my keyboard configuration, but the keys themselves still don’t seem to respond.

If I run roccatryosmkconfig from the command line, I get the following output:

Error creating proxy: Error receiving data: Connection reset by peer (g-io-error-quark, 44)

** (roccatryosmkconfig:10577): WARNING : 20:26:02.063: Could not get dbus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

** (roccatryosmkconfig:10577): CRITICAL **: 20:26:08.481: dbus_g_proxy_connect_signal: assertion ‘DBUS_IS_G_PROXY (proxy)’ failed

Can anyone suggest what the problem might be?

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