defaultMode on configmap not set

[khauser]

Describe the Issue

  volumes:
  - configMap:
      defaultMode: 511
      name: icm-11-azure-test-icm-as-jgroups-config-xml
    name: jgroups-config-volume

results in a ls -la on a normal pod:

-rwxrwxrwx 1 root      intershop 2201 Apr 29 13:34 jgroups-config.xml

and on a virtual-kublet it's:

drwxr-xr-x 2 root      root      4096 Apr 29 13:34 jgroups-config.xml

On both I configured:

  securityContext:
    fsGroup: 150
    fsGroupChangePolicy: OnRootMismatch
    runAsGroup: 150
    runAsNonRoot: false
    runAsUser: 150

Expected behavior
Both should look like:

-rwxrwxrwx 1 root      intershop 2201 Apr 29 13:34 jgroups-config.xml

Virtual-kubelet version
kubeletVersion: v1.25.0-vk-azure-aci-1.6.1
Kubernetes version
1.28.3
Additional context