Remove the Secret's OwnerReferences before pivot

cmd/clusterctl/phases/pivot.go

@@ -253,8 +253,12 @@ func moveSecret(from sourceClient, to targetClient, secret *corev1.Secret) error
 	// New objects cannot have a specified resource version. Clear it out.
 	secret.SetResourceVersion("")
 
-	// Remove owner reference.
-	secret.SetOwnerReferences(nil)
+	// Remove owner reference only if they're part of our known APIGroup
+	for _, ownerRef := range secret.OwnerReferences {
+		if ownerRef.APIVersion == clusterv1.GroupVersion.String() {
+			secret.SetOwnerReferences(nil)
+		}
+	}
 
 	if err := to.CreateSecret(secret); err != nil {
 		return errors.Wrapf(err, "error copying Secret %s/%s to target cluster", secret.Namespace, secret.Name)