Looking through the system logs (journalctl --boot), I stumbled on the following error messages from firewalld; it looks like the function iptables-restore is called fairly frequently, generally after the system wakes up from sleep, and never succeeds. The intervening lines vary.
Is this something to worry about?
Apr 09 07:16:49 amito firewalld[926]: ERROR: '/usr/sbin/iptables- restore -w -n' failed: iptables-restore: line 9 failed Apr 09 07:16:46 amito systemd[1]: Started Hostname Service. Apr 09 07:16:49 amito firewalld[926]: ERROR: '/usr/sbin/ip6tables- restore -w -n' failed: ip6tables-restore: line 9 failed Apr 09 07:16:46 amito NetworkManager[1020]: <info> [1617977806.4768] hostname: hostname: using hostnamed Apr 09 07:16:49 amito firewalld[926]: ERROR: COMMAND_FAILED: '/usr/sbin/ip6tables-restore -w -n' failed: ip6tables-restore: line 9 failed