Can't set custom hosts for coredns

[631068264]

Environmental Info:
K3s Version: v1.22.7+k3s1

Node(s) CPU architecture, OS, and Version:

Linux master 5.4.0-104-generic #118-Ubuntu SMP Wed Mar 2 19:02:41 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Cluster Configuration:

sigle
Describe the bug:

After kubectl edit configmap coredns when restart k3s service or add new node , the config will be rewrite as default.

Steps To Reproduce:

• I have read More extensibility to CoreDNS configmap #462 ,but not work for me.

Expected behavior:
I hope it can run like this

apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns-custom # this is the name of the configmap you can overwrite with your changes
  namespace: kube-system
data:
    test.override: | # you may select any name here, but it must end with the .override file extension
          hosts { 
              10.0.0.1 example1.org
              10.0.0.2 example2.org
              10.0.0.3 example3.org
              fallthrough
          }

Actual behavior:

Additional context / logs:

Backporting

• Needs backporting to older releases

[631068264]

apiVersion: v1
kind: ConfigMap
metadata:
  name: xxxx
  namespace: kube-system
data:
    xxx.server: | 
          example1.org example3.org  {
              hosts {
                   127.0.0.1 example1.org example3.org
                   fallthrough
              }
          }