I've been using Workrave on Ubuntu 22.04 for several years now; installed it following these instructions, activated the applet that shows timers in the top bar through Extensions, and added Workrave to my Startup Applications. All worked fine, until a few days ago, when I noticed that Workrave no longer started at startup. Somehow it had disappeared from my Startup Applications. Also, I can no longer activate the Workrave applet that shows timers in the top bar, in Extensions the toggle button is greyed out.
What happened, has something changed to Workrave, or to Ubuntu 22.04? Is there anything I can do to fix this (already tried updating, uninstall/re-install)?