Setup:
BM cluster, bond with enslaved interface vlans based on VFs, as master ovs system interface
oc get nns worker-0 -ojsob -o=jsonpath='{.status.currentState.interfaces[?(@.name=="bond0")].link-aggregation.port}'
["ens1f0v0.477","ens1f1v0.477"]

4.13

100%

1.Apply nncp to change mtu on VFs

  interfaces:
      - name: ens1f0v0
        type: ethernet
        state: up
        mtu: 3000
      - name: ens1f1v0
        type: ethernet
        state: up
        mtu: 3000

 2.Apply nncp to change mtu on VF.Vlans

    interfaces:
      - name: ens1f0v0.477
        type: vlan
        state: up
        controller: bond0 
        mtu: 3000
        vlan:
          base-iface: ens1f0v0
          id: 477
      - name: ens1f1v0.477
        type: vlan
        state: up
        mtu: 3000
        controller: bond0
        vlan:
          base-iface: ens1f1v0
          id: 477

1. MTU have been changed
2. but nncp failed with reason
 Bug: Manager(UnknownDevice): Master connection 'bond0' can't be activated: No
      device available\n'"

3. After reboot I lost  the worker, looks like interface vlans were not created

MTU changed, pollicy applied successfuly, reboot works

May 26 15:54:17 worker-1 NetworkManager[2473]: <info>  [1685116457.3594] audit: op="connection-activate" uuid="bffcae38-89b0-4680-98ac-a97aa10f31a5" name="ens1f1v0.477-slave-ovs-clone" pid=1289851 uid=0 result="fail" reason="Master connection 'bond0' can't be activated: No device available"
May 26 15:54:19 worker-1 NetworkManager[2473]: <info>  [1685116459.3643] audit: op="device-reapply" interface="ens1f0v0.477" ifindex=14 args="802-3-ethernet.mtu,connection.master" pid=1289851 uid=0 result="fail" reason="Can't reapply changes to 'connection.master' setting"
May 26 15:54:19 worker-1 NetworkManager[2473]: <info>  [1685116459.3660] audit: op="connection-activate" uuid="d87958ba-c8dc-476e-8c1f-81781bc63cd9" name="ens1f0v0.477-slave-ovs-clone" pid=1289851 uid=0 result="fail" reason="Master connection 'bond0' can't be activated: No device available"
May 26 15:54:19 worker-1 NetworkManager[2473]: <info>  [1685116459.3682] audit: op="device-reapply" interface="ens1f1v0.477" ifindex=18 args="802-3-ethernet.mtu,connection.master" pid=1289851 uid=0 result="fail" reason="Can't reapply changes to 'connection.master' setting"
May 26 15:54:19 worker-1 NetworkManager[2473]: <info>  [1685116459.3699] audit: op="connection-activate" uuid="bffcae38-89b0-4680-98ac-a97aa10f31a5" name="ens1f1v0.477-slave-ovs-clone" pid=1289851 uid=0 result="fail" reason="Master connection 'bond0' can't be activated: No device available"
May 26 15:54:22 worker-1 ovs-vswitchd[2461]: ovs|05106|connmgr|INFO|br-ex<->unix#30631: 2 flow_mods in the last 0 s (2 adds)
May 26 15:54:23 worker-1 NetworkManager[2473]: <info>  [1685116463.3750] audit: op="device-reapply" interface="ens1f0v0.477" ifindex=14 args="802-3-ethernet.mtu,connection.master" pid=1289851 uid=0 result="fail" reason="Can't reapply changes to 'connection.master' setting"
May 26 15:54:23 worker-1 NetworkManager[2473]: <info>  [1685116463.3767] audit: op="connection-activate" uuid="d87958ba-c8dc-476e-8c1f-81781bc63cd9" name="ens1f0v0.477-slave-ovs-clone" pid=1289851 uid=0 result="fail" reason="Master connection 'bond0' can't be activated: No device available"
May 26 15:54:23 worker-1 NetworkManager[2473]: <info>  [1685116463.3789] audit: op="device-reapply" interface="ens1f1v0.477" ifindex=18 args="802-3-ethernet.mtu,connection.master" pid=1289851 uid=0 result="fail" reason="Can't reapply changes to 'connection.master' setting"
May 26 15:54:23 worker-1 NetworkManager[2473]: <info>  [1685116463.3807] audit: op="connection-activate" uuid="bffcae38-89b0-4680-98ac-a97aa10f31a5" name="ens1f1v0.477-slave-ovs-clone" pid=1289851 uid=0 result="fail" reason="Master connection 'bond0' can't be activated: No device available"
May 26 15:54:31 worker-1 NetworkManager[2473]: <info>  [1685116471.3855] audit: op="device-reapply" interface="ens1f0v0.477" ifindex=14 args="802-3-ethernet.mtu,connection.master" pid=1289851 uid=0 result="fail" reason="Can't reapply changes to 'connection.master' setting"
May 26 15:54:31 worker-1 NetworkManager[2473]: <info>  [1685116471.3871] audit: op="connection-activate" uuid="d87958ba-c8dc-476e-8c1f-81781bc63cd9" name="ens1f0v0.477-slave-ovs-clone" pid=1289851 uid=0 result="fail" reason="Master connection 'bond0' can't be activated: No device available"
May 26 15:54:31 worker-1 NetworkManager[2473]: <info>  [1685116471.3891] audit: op="device-reapply" interface="ens1f1v0.477" ifindex=18 args="802-3-ethernet.mtu,connection.master" pid=1289851 uid=0 result="fail" reason="Can't reapply changes to 'connection.master' setting"
May 26 15:54:31 worker-1 NetworkManager[2473]: <info>  [1685116471.3907] audit: op="connection-activate" uuid="bffcae38-89b0-4680-98ac-a97aa10f31a5" name="ens1f1v0.477-slave-ovs-clone" pid=1289851 uid=0 result="fail" reason="Master connection 'bond0' can't be activated: No device available"