In Fedora 41 dnf5 suffers from a bug that prevents it from handling groups from RPM Fusion correctly. If I use dnf4 for configuring RPM Fusion and installing what I need from there, but continue to use dnf5 otherwise, will I suffer any nasty surprises down the line, like packages not updating, or getting deleted when they shouldn’t be, etc.?
Dnf5 and dnf4 have own db’s. So you will not be able to use all options while you try to fix installations with dnf.
If you need this urgently as you said, go for dnf4 instead.
In fact I mainly use Gnome Software, or in other words, packagekit. So if I was to just use dnf4 and packagekit, would I be okay, or is packagekit more tied to dnf5 somehow?
As I understood, on F41 package kit uses dnf5. You get the problem I described above. No 100% of using the commands to fix the installation with dnf because of having two databases.
Dnf history as an example would not show you all transactions because you used two db’s.