Better put than I would've said. I don't much care for lennart, but he's right about some things here. Sudo is unnecessarily huge so it being setuid binary is obviously not great.
Run0 isn't probably the solution, but something might emerge one day that handles privilege escalation in a more today's sane way than sudo.
Doas is kind of an option, but if you are gonna rework this, makes sense to re-think it more than 'leaner sudo'. Let's see what pops up some years later, after all, we all (probably) thought pulseaudio was gonna stay forever too.
Occasionally I get this on wake from suspend, doesn't matter if amd or nvidia system.
I just think of it as an annoying kde bug. It's harmless though.
You either reboot or just switch to another tty and unlock the session.
But the others are right, you increase chances of this happening if you updated the kde stack and didn't reboot/relog.