diff --git a/controllers/resourcesummary_collection.go b/controllers/resourcesummary_collection.go
index 3fcc7e32..99505255 100644
--- a/controllers/resourcesummary_collection.go
+++ b/controllers/resourcesummary_collection.go
@@ -647,19 +647,20 @@ func resetResourceSummaryStatus(ctx context.Context, remoteClient client.Client,
 // markDriftedHelmCharts sets NeedsRedeploy on the HelmReleaseSummaries entries matching
 // driftedCharts (by release name/namespace), so shouldUpgrade can later scope the redeploy
 // to only those charts instead of the whole Helm feature. If driftedCharts is empty (e.g. an
-// older drift-detection-manager that doesn't report chart ownership yet), every chart is
-// marked, same as today's behavior, so drift is never silently missed.
+// older drift-detection-manager that doesn't report chart ownership yet), or none of the reported
+// charts is a chart of this ClusterSummary (e.g. an older sveltos-applier that reports the
+// ConfigurationGroup instead of the Helm releases), every chart is marked, so drift is never
+// silently missed.
 func markDriftedHelmCharts(clusterSummary *configv1beta1.ClusterSummary,
 	driftedCharts []libsveltosv1beta1.HelmChartRef, logger logr.Logger) {
 
 	if len(driftedCharts) == 0 {
 		logger.V(logs.LogDebug).Info("no chart-scoped drift info available, marking all charts for redeploy")
-		for i := range clusterSummary.Status.HelmReleaseSummaries {
-			clusterSummary.Status.HelmReleaseSummaries[i].NeedsRedeploy = true
-		}
+		markAllHelmChartsForRedeploy(clusterSummary)
 		return
 	}
 
+	matched := false
 	for i := range clusterSummary.Status.HelmReleaseSummaries {
 		summary := &clusterSummary.Status.HelmReleaseSummaries[i]
 		for j := range driftedCharts {
@@ -667,10 +668,22 @@ func markDriftedHelmCharts(clusterSummary *configv1beta1.ClusterSummary,
 				summary.ReleaseNamespace == driftedCharts[j].ReleaseNamespace {
 
 				summary.NeedsRedeploy = true
+				matched = true
 				break
 			}
 		}
 	}
+
+	if !matched {
+		logger.V(logs.LogDebug).Info("reported drifted charts do not match any chart, marking all charts for redeploy")
+		markAllHelmChartsForRedeploy(clusterSummary)
+	}
+}
+
+func markAllHelmChartsForRedeploy(clusterSummary *configv1beta1.ClusterSummary) {
+	for i := range clusterSummary.Status.HelmReleaseSummaries {
+		clusterSummary.Status.HelmReleaseSummaries[i].NeedsRedeploy = true
+	}
 }
 
 func getListOfClusterWithDriftDetectionDeployed(ctx context.Context, c client.Client,
diff --git a/controllers/resourcesummary_collection_test.go b/controllers/resourcesummary_collection_test.go
index 88073d7c..159bad78 100644
--- a/controllers/resourcesummary_collection_test.go
+++ b/controllers/resourcesummary_collection_test.go
@@ -397,6 +397,45 @@ var _ = Describe("ResourceSummary Collection", func() {
 		}
 	})
 
+	It("markDriftedHelmCharts marks only the reported charts", func() {
+		driftedChart := configv1beta1.HelmChartSummary{ReleaseName: randomString(), ReleaseNamespace: randomString()}
+		otherChart := configv1beta1.HelmChartSummary{ReleaseName: randomString(), ReleaseNamespace: randomString()}
+		clusterSummary := &configv1beta1.ClusterSummary{
+			Status: configv1beta1.ClusterSummaryStatus{
+				HelmReleaseSummaries: []configv1beta1.HelmChartSummary{driftedChart, otherChart},
+			},
+		}
+
+		driftedCharts := []libsveltosv1beta1.HelmChartRef{
+			{ReleaseName: driftedChart.ReleaseName, ReleaseNamespace: driftedChart.ReleaseNamespace},
+		}
+		controllers.MarkDriftedHelmCharts(clusterSummary, driftedCharts, textlogger.NewLogger(textlogger.NewConfig()))
+
+		Expect(clusterSummary.Status.HelmReleaseSummaries[0].NeedsRedeploy).To(BeTrue())
+		Expect(clusterSummary.Status.HelmReleaseSummaries[1].NeedsRedeploy).To(BeFalse())
+	})
+
+	It("markDriftedHelmCharts marks every chart when no reported chart matches a chart of the ClusterSummary", func() {
+		clusterSummary := &configv1beta1.ClusterSummary{
+			Status: configv1beta1.ClusterSummaryStatus{
+				HelmReleaseSummaries: []configv1beta1.HelmChartSummary{
+					{ReleaseName: randomString(), ReleaseNamespace: randomString()},
+					{ReleaseName: randomString(), ReleaseNamespace: randomString()},
+				},
+			},
+		}
+
+		// What an agent that does not know the Helm releases reports: a name that is not a release
+		driftedCharts := []libsveltosv1beta1.HelmChartRef{
+			{ReleaseName: randomString(), ReleaseNamespace: randomString()},
+		}
+		controllers.MarkDriftedHelmCharts(clusterSummary, driftedCharts, textlogger.NewLogger(textlogger.NewConfig()))
+
+		for i := range clusterSummary.Status.HelmReleaseSummaries {
+			Expect(clusterSummary.Status.HelmReleaseSummaries[i].NeedsRedeploy).To(BeTrue())
+		}
+	})
+
 	It("isResourceSummaryInstalledCached caches positive result", func() {
 		controllers.ResetResourceSummaryInstalledCache()