Can not run "ip link set lo down" inside OCP 4.11 Pod even though the capabilities have been set against the binary

OpenShift 4.11

100%

1. Create such Dockerfile

FROM registry.access.redhat.com/ubi8/ubi:8.5 
RUN dnf install -y iputils net-tools iproute 
RUN setcap cap_net_admin+ep /usr/sbin/ip 
CMD sleep infinity 

2. Create such Pod

apiVersion: v1
kind: Pod
metadata:
  name: testpod
spec:
  containers:
  - name: appcntr1
    image: quay.io/rhn_support_cchen/iplink:v1.0 # iplink:v1.0 is built with the above Dockerfile
    imagePullPolicy: IfNotPresent
    command: [ "/bin/bash", "-c", "--" ]
    args: [ "while true; do sleep 300000; done;" ]
    securityContext:
      runAsGroup: 9999
      runAsUser: 9999
      capabilities:
        add: ["NET_ADMIN"]

3. Check the result
 
$ oc get pods
NAME      READY   STATUS    RESTARTS   AGE
testpod   1/1     Running   0          5m17s
$ oc rsh testpod ip link set lo up
RTNETLINK answers: Operation not permitted 

$ oc rsh testpod ip link set lo up
RTNETLINK answers: Operation not permitted 

ip link set lo up should succeed

This issue is blocking Nokia to run test on OCP 4.11 for their solution