Egress router POD creation is failing while using openshift-sdn network plugin

Egress router POD creation on Openshift 4.11 is failing with below error.
~~~
Nov 15 21:51:29 pltocpwn03 hyperkube[3237]: E1115 21:51:29.467436    3237 pod_workers.go:951] "Error syncing pod, skipping" err="failed to \"CreatePodSandbox\" for \"stage-wfe-proxy-ext-qrhjw_stage-wfe-proxy(c965a287-28aa-47b6-9e79-0cc0e209fcf2)\" with CreatePodSandboxError: \"Failed to create sandbox for pod \\\"stage-wfe-proxy-ext-qrhjw_stage-wfe-proxy(c965a287-28aa-47b6-9e79-0cc0e209fcf2)\\\": rpc error: code = Unknown desc = failed to create pod network sandbox k8s_stage-wfe-proxy-ext-qrhjw_stage-wfe-proxy_c965a287-28aa-47b6-9e79-0cc0e209fcf2_0(72bcf9e52b199061d6e651e84b0892efc142601b2442c2d00b92a1ba23208344): error adding pod stage-wfe-proxy_stage-wfe-proxy-ext-qrhjw to CNI network \\\"multus-cni-network\\\": plugin type=\\\"multus\\\" name=\\\"multus-cni-network\\\" failed (add): [stage-wfe-proxy/stage-wfe-proxy-ext-qrhjw/c965a287-28aa-47b6-9e79-0cc0e209fcf2:openshift-sdn]: error adding container to network \\\"openshift-sdn\\\": CNI request failed with status 400: 'could not open netns \\\"/var/run/netns/8c5ca402-3381-4935-baed-ea454161d669\\\": unknown FS magic on \\\"/var/run/netns/8c5ca402-3381-4935-baed-ea454161d669\\\": 1021994\\n'\"" pod="stage-wfe-proxy/stage-wfe-proxy-ext-qrhjw" podUID=c965a287-28aa-47b6-9e79-0cc0e209fcf2
~~~

I have checked SDN POD log from node where egress router POD is failing and I could see below error message.

~~~
2022-11-15T21:51:29.283002590Z W1115 21:51:29.282954  181720 pod.go:296] CNI_ADD stage-wfe-proxy/stage-wfe-proxy-ext-qrhjw failed: could not open netns "/var/run/netns/8c5ca402-3381-4935-baed-ea454161d669": unknown FS magic on "/var/run/netns/8c5ca402-3381-4935-baed-ea454161d669": 1021994
~~~

Crio is logging below event and looking at the log it seems the namespace has been created on node.

~~~
Nov 15 21:51:29 pltocpwn03 crio[3150]: time="2022-11-15 21:51:29.307184956Z" level=info msg="Got pod network &{Name:stage-wfe-proxy-ext-qrhjw Namespace:stage-wfe-proxy ID:72bcf9e52b199061d6e651e84b0892efc142601b2442c2d00b92a1ba23208344 UID:c965a287-28aa-47b6-9e79-0cc0e209fcf2 NetNS:/var/run/netns/8c5ca402-3381-4935-baed-ea454161d669 Networks:[] RuntimeConfig:map[multus-cni-network:{IP: MAC: PortMappings:[] Bandwidth:<nil> IpRanges:[]}] Aliases:map[]}"
~~~

4.11.12

Not Sure

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Egress router POD is failing to create. Sample application could be created without any issue.

Egress router POD should get created

Egress router POD is created following below document and it does contain pod.network.openshift.io/assign-macvlan: "true" annotation.

https://docs.openshift.com/container-platform/4.11/networking/openshift_sdn/deploying-egress-router-layer3-redirection.html#nw-egress-router-pod_deploying-egress-router-layer3-redirection