I didn’t know about this project, so I took a quick look around.
I didn’t see any mention of Telemetry or Metrics, but I assume they can use this:
After starting Tails and connecting to Tor, Tails Upgrader automatically checks if upgrades are available and then proposes you to upgrade your USB stick. The upgrades are checked for and downloaded through Tor.
https://tails.net/doc/upgrade/index.en.html#automatic
Still, I just gave this a few minutes, so there could be more.
The only two things I can currently think of are:
Honestly I’m not sure if it will help but I don’t have other ideas aside from purging the configuration, which is probably not the solution and unwarrented.
Another thing to try would be a search on the KDE bugtracker.