Yes, I had uploaded kf6 to unstable but there were some missing uploads of kf5 packages that are required to handle coinstallability of kf5 and kf6.
This should now be fixed for all kf5 and kf6 packages and every package should be installable from both stacks. Note that until we move to Plasma 6 the kf6/qt6 applications will use the default Qt6 team which may not look entirely integrated into the Plasma 5 / qt5 breeze theme. Happy hacking, -- Aurélien
