> rpm -q -f /etc/group
setup-2.13.6-2.fc32.noarch
> dnf diff $(rpm -q -f /etc/group) /etc/group | grep -e wheel
-wheel:x:10:
+wheel:x:10:vgaetera
This means an empty wheel group is in the default configuration for the setup package.
It looks like something has gone wrong in your case.
You should submit an issue if you can reproduce the problem.