Today, I had a very annoying problem that I managed to fix. It's a couple of hours of my life that I won't get back, and I found very little online to help me.
So, to help anyone else with the same problem, here's the problem and the solution.
For what it's worth, this is with Fedora 39, KDE Plasma spin. But I honestly suspect that makes little difference. Other distros (Debian, Ubuntu, etc.) are probably just the same.