Hello @stalecu and welcome.
sudo dnf in -y ... is never a good choice because you accept changes in advance so you don’t have any control on what’s going on.
Plasma6 is finally working fine in cooker. ROME is expected to receive a big update, including Plasma6, in the next hours or so.
ROME users should bookmark this topic, and/or enable notifications if not done already:
ROME major upgrade expected
that’s where we announce major upgrades, warnings, tips and workarounds.
Please read carefully before to perform ROME upgrades.