network service outputs some error messages during shutdown when IFDOWN_ON_SHUTDOWN=no

Issue

IFDOWN_ON_SHUTDOWN was introduced from RHEL7.6
Chapter 11. Installation and Booting Red Hat Enterprise Linux 7

Error messages appear during shutdown when IFDOWN_ON_SHUTDOWN=no

09:49:05 localhost.localdomain systemd[1]: Stopped target Remote File Systems (Pre).
09:49:05 localhost.localdomain systemd[1]: Stopped target NFS client services.
09:49:05 localhost.localdomain systemd[1]: Stopping GSSAPI Proxy Daemon...
09:49:05 localhost.localdomain systemd[1]: Stopped GSSAPI Proxy Daemon.
09:49:05 localhost.localdomain network[3388]: ERROR     : [/etc/rc.d/init.d/network] system is shutting down, leaving interfaces up as requested <==== ERROR message 
09:49:05 localhost.localdomain /etc/rc.d/init.d/network[3406]: system is shutting down, leaving interfaces up as requested
09:49:05 localhost.localdomain NetworkManager[2477]: <info>  [1553647745.8857] caught SIGTERM, shutting down normally.
09:49:05 localhost.localdomain systemd[1]: network.service: control process exited, code=exited status=1
09:49:05 localhost.localdomain systemd[1]: Stopped LSB: Bring up/down networking.
09:49:05 localhost.localdomain systemd[1]: Unit network.service entered failed state.
09:49:05 localhost.localdomain systemd[1]: network.service failed.  <========== failed message