So as of late yesterday, System Admin ver. 15.0.21.71 was promoted to stable which should resolve the fail2ban starting issue. Upgrading sysadmin can be done in the conventional way using the GUI or you can run:
fwconsole ma upgrade downloadinstall sysadmin --tag 15.0.21.71
confirm installed version with:
fwconsole ma list | grep sysadmin
confirm fail2ban status with
systemctl status fail2ban
restart fail2ban with
systemctl restart fail2ban