There's a new allowipv6 setting in fail2ban which is supposed to be specified in /etc/fail2ban.conf but isn't currently. For the time being it's defaulting to auto if it's not set and just complaining about it in a log message, but my understanding is that eventually the debug complaining is going to turn into a failure if it's not set, and in any case it should be set there to make the complaining log message go away.
Upstream has reduced this log message to a debug message, so this will go away in the next release.
FEDORA-EPEL-2023-07bf30a1f1 has been submitted as an update to Fedora EPEL 9. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-07bf30a1f1
FEDORA-EPEL-2023-07bf30a1f1 has been pushed to the Fedora EPEL 9 testing repository. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-07bf30a1f1 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-EPEL-2023-07bf30a1f1 has been pushed to the Fedora EPEL 9 stable repository. If problem still persists, please make note of it in this bug report.