Unknown field logs in Machine Config Operator Pod in RHOCP 4

Issue

• The logs in the Machine-Config-Operator pod flooded with unknown field warnings after upgrading the cluster to version 4.12.

  $  oc logs machine-config-controller-xxxxxxxxxx-xxxxx   -c machine-config-controller -n openshift-machine-config-operator
  
  W0807 13:15:52.597359 1 warnings.go:70] unknown field "spec.dns.metadata.creationTimestamp"
  W0807 13:15:52.597379 1 warnings.go:70] unknown field "spec.dns.metadata.generation"
  W0807 13:15:52.597385 1 warnings.go:70] unknown field "spec.dns.metadata.managedFields"
  W0807 13:15:52.597391 1 warnings.go:70] unknown field "spec.dns.metadata.name"
  W0807 13:15:52.597398 1 warnings.go:70] unknown field "spec.dns.metadata.resourceVersion"
  W0807 13:15:52.597478 1 warnings.go:70] unknown field "spec.dns.metadata.uid"
  W0807 13:15:52.597487 1 warnings.go:70] unknown field "spec.infra.metadata.creationTimestamp"
  W0807 13:15:52.597494 1 warnings.go:70] unknown field "spec.infra.metadata.generation"
  W0807 13:15:52.597501 1 warnings.go:70] unknown field "spec.infra.metadata.managedFields"
  W0807 13:15:52.597508 1 warnings.go:70] unknown field "spec.infra.metadata.name"
  W0807 13:15:52.597516 1 warnings.go:70] unknown field "spec.infra.metadata.resourceVersion"
  W0807 13:15:52.597524 1 warnings.go:70] unknown field "spec.infra.metadata.uid"
  W0807 13:20:27.386747 1 warnings.go:70] unknown field "spec.dns.metadata.creationTimestamp"
  W0807 13:20:27.386771 1 warnings.go:70] unknown field "spec.dns.metadata.generation"
  W0807 13:20:27.386776 1 warnings.go:70] unknown field "spec.dns.metadata.managedFields"
  W0807 13:20:27.386782 1 warnings.go:70] unknown field "spec.dns.metadata.name"
  W0807 13:20:27.386787 1 warnings.go:70] unknown field "spec.dns.metadata.resourceVersion"
  W0807 13:20:27.386791 1 warnings.go:70] unknown field "spec.dns.metadata.uid"