The krb5-server package includes the Kerberos bug-reporting application
but the category list /usr/kerberos/share/gnats/mit is not installed, so
the application won't run.
The fix is simply to have the RPM install the missing file, which comes
with the MIT Kerberos distribution.
I'll submit the bug I was trying to report to MIT separately just for your
information, but I did manage to find the missing file and report it
directly to the Kerberos team already.
Should be fixed in 1.2.1-17, coming soon to Raw Hide. Thanks!