Welsome to OpenMandriva @Souchon
Post edit: I agree with @AngryPenguin and @mandian about a partial upgrade being the likely cause of your issue.
Uh, it might have been better to use sudo rpm -e --test that might have provided some useful output.
Off topic but moderator Hint: You can and should post code as code.
My guess to solve your issue is first to manually install the packages you removed with rpm. Then open /var/log/dnf.log and find the transaction you mention in your first post. Then if there are packages in the list to be installed or upgraded, install or upgrade all of them with rpm command. Post-edit: I mean you need to install or upgrade all packages that the system had selected not just packages selected by you.
OpenMandriva Lx 4.2 repositories are here.
I never use dnfdragora or Discover to upgrade any OM Lx system. I allways use cli from Konsole:
For Rock:
$ dnf clean all ; sudo dnf clean all ; sudo dnf upgrade
For Rolling:
$ dnf clean all ; sudo dnf clean all ; sudo dnf distro-sync