Per some feedback, I tried on another distro. Fedora 43 (hot off the presses) only has some of these bugs. I couldn’t reproduce 1, 2, and 4 here on Fedora 43 KDE live.

The first mistake is using Kubuntu. It’s always been a buggy mess.

Considering my experience with Kubuntu 24.04, I’m inclined to agree. But it gets top billing on kde.org because (it seems) Ubuntu pays more money than SUSE.

https://kde.org/distributions/

What distro? I was on Kubuntu 25.10. Did you record it? It’s hard to see in real time.