As an update to this thread. I switched from Debian Testing to Fedora because of how slow is Debian to update KDE apps or anything in general.
In my experience, I strongly recommend using Debian only if you need a lot of stability, otherwise, try to use another distro instead.
If you like APT and Debian in general, I suggest you to switch to KDE Neon. It’s based on Ubuntu with updated KDE packages, and Ubuntu is based on Debian with more updated packages.