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Similar situation happens with RHEL7, though the effect is not directly visible ('systemctl stop iptables' doesn't print anything), yet unit log shows the problem:

Sep 21 12:31:09 vrhel7 iptables.init[30003]: restorecon is /sbin/restorecon
Sep 21 12:31:09 vrhel7 iptables.init[30003]: iptables: Setting chains to policy ACCEPT: security filter nat [FAILED]
Sep 21 12:31:09 vrhel7 iptables.init[30003]: iptables: Flushing firewall rules: [  OK  ]
Sep 21 12:31:09 vrhel7 iptables.init[30003]: iptables: Unloading modules: [  OK  ]
Sep 21 12:31:09 vrhel7 systemd[1]: Stopped IPv4 firewall with iptables.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3093