Why the audit policy is capturing logs for only 'networkpolicy' changes but not for 'egressnetworkpolicy'?

Issue

• For a security requirement to audit the changes for networkpolicy and egressnetworkpolicy, below policy is applied with group extensions, however only logs related to networkpolicy are generated and not for egressnetworkpolicy.

root@ocp-master-201:  ~$ cat /etc/origin/master/adv-audit.yaml
apiVersion: audit.k8s.io/v1beta1
kind: Policy
rules:
  - level: RequestResponse
    users:
    verbs:
    resources:
    - group: "" # core API group
    - group: "extensions"
root@ocp-master-201:  ~$ 

• How to generate the logs for egressnetworkpolicy?