diff --git a/internal/monitoring/monitor_pve_guest_lxc.go b/internal/monitoring/monitor_pve_guest_lxc.go
index a827708ae..7cbb4c379 100644
--- a/internal/monitoring/monitor_pve_guest_lxc.go
+++ b/internal/monitoring/monitor_pve_guest_lxc.go
@@ -179,6 +179,12 @@ func (m *Monitor) buildContainerFromClusterResource(
 	}
 
 	m.enrichContainerMetadata(ctx, client, instanceName, res.Node, &container, statusSnapshot)
+	// The per-node fallback path applies node-local pct df data after metadata
+	// enrichment (monitor_polling_containers.go); the efficient cluster/resources
+	// path must do the same or installs served by it never surface the host
+	// agent's per-mount usage and fall back to config-listed mounts with
+	// unknown usage (#1477).
+	m.enrichContainerWithAgentLXCFilesystems(instanceName, res.Node, &container, sampleTime)
 
 	// For non-running containers, zero out resource usage metrics to prevent false alerts.
 	// Proxmox may report stale or residual metrics for stopped containers.
diff --git a/internal/monitoring/monitor_pve_guest_lxc_test.go b/internal/monitoring/monitor_pve_guest_lxc_test.go
index 88c55a2f6..4b1e82bb6 100644
--- a/internal/monitoring/monitor_pve_guest_lxc_test.go
+++ b/internal/monitoring/monitor_pve_guest_lxc_test.go
@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/rcourtman/pulse-go-rewrite/internal/models"
+	agentshost "github.com/rcourtman/pulse-go-rewrite/pkg/agents/host"
 	"github.com/rcourtman/pulse-go-rewrite/pkg/proxmox"
 )
 
@@ -393,3 +394,69 @@ func TestIssue1477ConfigOnlyMountsSurviveIntoContainerDisks(t *testing.T) {
 		t.Fatalf("config-only mount must keep device and mp key, got %+v", archive)
 	}
 }
+
+// The efficient cluster/resources path must apply the host agent's node-local
+// pct df data the same way the per-node fallback path does. Before the #1477
+// fix it skipped that enrichment entirely, so cluster-served installs never
+// surfaced per-mount usage regardless of a healthy linked agent.
+func TestBuildContainerFromClusterResource_AppliesAgentLXCFilesystems(t *testing.T) {
+	monitor := newTestMonitor(t)
+	monitor.state.UpdateNodesForInstance("cluster-a", []models.Node{{
+		ID:       "cluster-a-pve-a",
+		Name:     "pve-a",
+		Instance: "cluster-a",
+		Status:   "online",
+	}})
+
+	now := time.Now()
+	monitor.applyAgentLXCFilesystems("cluster-a-pve-a", "agent-1", &agentshost.ProxmoxLXCInventory{
+		Containers: []agentshost.ProxmoxLXCContainer{{
+			VMID: 202,
+			Name: "cache-ct",
+			Disks: []agentshost.Disk{
+				{Device: "local:202/vm-202-disk-0.raw", Mountpoint: "/", Type: "rootfs", TotalBytes: 32 << 30, UsedBytes: 8 << 30, FreeBytes: 24 << 30, Usage: 25},
+				{Device: "/mnt/tank/cache", Mountpoint: "/data", Type: "mp0", TotalBytes: 100 << 30, UsedBytes: 50 << 30, FreeBytes: 50 << 30, Usage: 50},
+			},
+		}},
+		CollectedAt: now.UTC(),
+	}, now, 30)
+
+	client := &stubPVEClientLXCStatus{
+		containerStatus: &proxmox.Container{Status: "running"},
+	}
+	resource := proxmox.ClusterResource{
+		Type:    "lxc",
+		Node:    "pve-a",
+		Name:    "cache-ct",
+		Status:  "running",
+		VMID:    202,
+		MaxCPU:  2,
+		MaxMem:  4096,
+		Mem:     2048,
+		MaxDisk: 32 << 30,
+		Disk:    8 << 30,
+	}
+
+	container, _, _, _, ok := monitor.buildContainerFromClusterResource(
+		context.Background(),
+		"cluster-a",
+		resource,
+		client,
+		map[int]bool{},
+	)
+	if !ok {
+		t.Fatal("expected container to be built")
+	}
+	if len(container.Disks) != 2 {
+		t.Fatalf("expected 2 disks from agent pct df enrichment, got %d: %+v", len(container.Disks), container.Disks)
+	}
+	var dataMount *models.Disk
+	for i := range container.Disks {
+		if container.Disks[i].Mountpoint == "/data" {
+			dataMount = &container.Disks[i]
+		}
+	}
+	if dataMount == nil || dataMount.Total != 100<<30 || dataMount.Used != 50<<30 {
+		t.Fatalf("expected /data mount with real usage from agent data, got %+v", container.Disks)
+	}
+}