diff --git a/manifests/cluster-manager/management/cluster-manager-registration-webhook-deployment.yaml b/manifests/cluster-manager/management/cluster-manager-registration-webhook-deployment.yaml
index e1580f9a4..eee2cb0d8 100644
--- a/manifests/cluster-manager/management/cluster-manager-registration-webhook-deployment.yaml
+++ b/manifests/cluster-manager/management/cluster-manager-registration-webhook-deployment.yaml
@@ -48,6 +48,7 @@ spec:
           - "--secure-port=6443"
           - "--tls-cert-file=/serving-cert/tls.crt"
           - "--tls-private-key-file=/serving-cert/tls.key"
+          - "--feature-gates=DefaultClusterSet=true"
           {{ if .DetachedMode }}
           - "--kubeconfig=/var/run/secrets/hub/kubeconfig"
           - "--authentication-kubeconfig=/var/run/secrets/hub/kubeconfig"
diff --git a/test/e2e/placement_test.go b/test/e2e/placement_test.go
index 2b7625386..42a8bda97 100644
--- a/test/e2e/placement_test.go
+++ b/test/e2e/placement_test.go
@@ -107,6 +107,14 @@ var _ = Describe("Placement", func() {
 				Namespace: placementNamespace,
 				Name:      placementName,
 			},
+			Spec: clusterapiv1beta1.PlacementSpec{
+				Tolerations: []clusterapiv1beta1.Toleration{
+					{
+						Key:      "cluster.open-cluster-management.io/unreachable",
+						Operator: clusterapiv1beta1.TolerationOpExists,
+					},
+				},
+			},
 		}
 
 		placement, err = t.ClusterClient.ClusterV1beta1().Placements(placementNamespace).Create(context.TODO(), placement, metav1.CreateOptions{})