

I can’t comment on Debian Testing.
I just run stable and pull cutting edge stuff from back-ports or flathub.
For some fancy stuff there’s usually a .deb file to download from the official site.
If I’m really desperate, there’s always piping a curl command to sudo, if I really really trust the provider.
Oh, yeah. None of my usual techniques would help get newer KDE on stable.
I guess there’s a chance it’s in back-ports, or will get there soon.