Centos Stream 9: NetworkManager/conf.d/ override mtu received from dhcp

Hello, I'm new to the list; I am working on moving an application to Centos Stream 9 running inside an openstack cloud virtual guest.  I have created:
to prevent Network Manager from overwriting the /etc/resolv.conf with incorrect DNS server entries from our DHCP service. This is working.

I also need to tell Network Manager to override the MTU provided by the DHCP service (which is telling my interfaces to use mtu=9000).  I have created:

then: systemctl reload NetworkManager

I can then:  nmcli device modify eth0 ethernet.mtu 1500  and it changes the mtu to 1500 (shown in: ip address show).  However, when I reboot, it changes back to mtu 9000.

ifcfg-eth0 file still contains MTU=9000

Can someone provide some guidance on how this should work please?


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