velero restore of a namespace is in PartiallyFailed phase

Issue

• velero restore is in PartiallyFailed phase, although all items in the namespace are completely restored. The restored application is up and running and the route is also working for the application. Velero restore logs, however, show the below errors:

  $ velero restore logs test-restore | grep error
  time="2023-10-23T11:50:01Z" level=error msg="Error retrieving in-cluster version of test-ns/nginx-unprivileged:latest: imagestreamtags.image.openshift.io \"nginx-unprivileged:latest\" not found" logSource="/remote-source/velero/app/pkg/restore/restore.go:1360" restore=openshift-adp/test-restore
  time="2023-10-23T11:50:02Z" level=error msg="Namespace test-ns, resource restore error: imagestreamtags.image.openshift.io \"nginx-unprivileged:latest\" not found" logSource="/remote-source/velero/app/pkg/controller/restore_controller.go:499" restore=openshift-adp/test-restore