diff --git a/weed/admin/plugin/plugin_scheduler.go b/weed/admin/plugin/plugin_scheduler.go
index 83c04f0f4..5db4ddf11 100644
--- a/weed/admin/plugin/plugin_scheduler.go
+++ b/weed/admin/plugin/plugin_scheduler.go
@@ -186,8 +186,8 @@ func (r *Plugin) runLaneSchedulerIterationLocked(ls *schedulerLaneState, jobType
 		}
 	}
 
-	r.pruneSchedulerState(active)
-	r.pruneDetectorLeases(active)
+	r.pruneSchedulerState(ls.lane, active)
+	r.pruneDetectorLeases(ls.lane, active)
 	r.setLaneLoopState(ls, "", "idle")
 	return hadJobs
 }
@@ -213,8 +213,8 @@ func (r *Plugin) runLaneSchedulerIterationConcurrent(ls *schedulerLaneState, job
 	}
 	wg.Wait()
 
-	r.pruneSchedulerState(active)
-	r.pruneDetectorLeases(active)
+	r.pruneSchedulerState(ls.lane, active)
+	r.pruneDetectorLeases(ls.lane, active)
 	r.setLaneLoopState(ls, "", "idle")
 	return hadJobs.Load()
 }
@@ -746,11 +746,16 @@ func (r *Plugin) finishDetection(jobType string) {
 	r.schedulerMu.Unlock()
 }
 
-func (r *Plugin) pruneSchedulerState(activeJobTypes map[string]struct{}) {
+// pruneSchedulerState removes next-detection state for inactive job types
+// in lane only. Prune must not touch other lanes' entries in the global map.
+func (r *Plugin) pruneSchedulerState(lane SchedulerLane, activeJobTypes map[string]struct{}) {
 	r.schedulerMu.Lock()
 	defer r.schedulerMu.Unlock()
 
 	for jobType := range r.nextDetectionAt {
+		if JobTypeLane(jobType) != lane {
+			continue
+		}
 		if _, ok := activeJobTypes[jobType]; !ok {
 			delete(r.nextDetectionAt, jobType)
 			delete(r.detectionInFlight, jobType)
@@ -766,11 +771,15 @@ func (r *Plugin) clearSchedulerJobType(jobType string) {
 	r.clearDetectorLease(jobType, "")
 }
 
-func (r *Plugin) pruneDetectorLeases(activeJobTypes map[string]struct{}) {
+// pruneDetectorLeases removes detector leases for inactive job types in lane only.
+func (r *Plugin) pruneDetectorLeases(lane SchedulerLane, activeJobTypes map[string]struct{}) {
 	r.detectorLeaseMu.Lock()
 	defer r.detectorLeaseMu.Unlock()
 
 	for jobType := range r.detectorLeases {
+		if JobTypeLane(jobType) != lane {
+			continue
+		}
 		if _, ok := activeJobTypes[jobType]; !ok {
 			delete(r.detectorLeases, jobType)
 		}
diff --git a/weed/admin/plugin/plugin_scheduler_test.go b/weed/admin/plugin/plugin_scheduler_test.go
index cf876f3b4..99b374b77 100644
--- a/weed/admin/plugin/plugin_scheduler_test.go
+++ b/weed/admin/plugin/plugin_scheduler_test.go
@@ -673,3 +673,118 @@ func TestRunLaneSchedulerIterationLockBehavior(t *testing.T) {
 		})
 	}
 }
+
+// ---------- lane-scoped prune ----------
+
+func TestPruneSchedulerState_DefaultLaneKeepsForeignLanesAndPrunesOwnStale(t *testing.T) {
+	p, err := New(Options{})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	defer p.Shutdown()
+
+	now := time.Now().UTC()
+	p.schedulerMu.Lock()
+	p.nextDetectionAt["s3_lifecycle"] = now.Add(24 * time.Hour) // lifecycle lane
+	p.nextDetectionAt["vacuum"] = now.Add(time.Minute)          // default lane, active
+	p.nextDetectionAt["ec_balance"] = now.Add(time.Minute)      // default lane, stale
+	p.detectionInFlight["ec_balance"] = true
+	p.schedulerMu.Unlock()
+
+	// Default-lane iteration prunes with only its own active job types.
+	p.pruneSchedulerState(LaneDefault, map[string]struct{}{"vacuum": {}})
+
+	p.schedulerMu.Lock()
+	defer p.schedulerMu.Unlock()
+	if _, ok := p.nextDetectionAt["s3_lifecycle"]; !ok {
+		t.Fatal("default-lane prune must not delete lifecycle-lane nextDetectionAt[s3_lifecycle]")
+	}
+	if _, ok := p.nextDetectionAt["vacuum"]; !ok {
+		t.Fatal("active default-lane job (vacuum) must be kept")
+	}
+	if _, ok := p.nextDetectionAt["ec_balance"]; ok {
+		t.Fatal("stale default-lane job (ec_balance) must still be pruned within its own lane")
+	}
+	if _, ok := p.detectionInFlight["ec_balance"]; ok {
+		t.Fatal("pruned job must also drop its detectionInFlight entry")
+	}
+}
+
+func TestPruneSchedulerState_LifecycleLaneLeavesDefaultLane(t *testing.T) {
+	p, err := New(Options{})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	defer p.Shutdown()
+
+	now := time.Now().UTC()
+	p.schedulerMu.Lock()
+	p.nextDetectionAt["vacuum"] = now.Add(time.Minute)          // default lane
+	p.nextDetectionAt["s3_lifecycle"] = now.Add(24 * time.Hour) // lifecycle lane, active
+	p.schedulerMu.Unlock()
+
+	p.pruneSchedulerState(LaneLifecycle, map[string]struct{}{"s3_lifecycle": {}})
+
+	p.schedulerMu.Lock()
+	defer p.schedulerMu.Unlock()
+	if _, ok := p.nextDetectionAt["vacuum"]; !ok {
+		t.Fatal("lifecycle-lane prune must not delete default-lane nextDetectionAt[vacuum]")
+	}
+	if _, ok := p.nextDetectionAt["s3_lifecycle"]; !ok {
+		t.Fatal("active lifecycle job (s3_lifecycle) must be kept")
+	}
+}
+
+func TestPruneDetectorLeases_IsLaneScoped(t *testing.T) {
+	p, err := New(Options{})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	defer p.Shutdown()
+
+	p.detectorLeaseMu.Lock()
+	p.detectorLeases["s3_lifecycle"] = "worker-a" // lifecycle lane
+	p.detectorLeases["vacuum"] = "worker-b"       // default lane, active
+	p.detectorLeases["ec_balance"] = "worker-c"   // default lane, stale
+	p.detectorLeaseMu.Unlock()
+
+	p.pruneDetectorLeases(LaneDefault, map[string]struct{}{"vacuum": {}})
+
+	p.detectorLeaseMu.Lock()
+	defer p.detectorLeaseMu.Unlock()
+	if _, ok := p.detectorLeases["s3_lifecycle"]; !ok {
+		t.Fatal("default-lane prune must not delete lifecycle-lane detector lease")
+	}
+	if _, ok := p.detectorLeases["vacuum"]; !ok {
+		t.Fatal("active default-lane detector lease (vacuum) must be kept")
+	}
+	if _, ok := p.detectorLeases["ec_balance"]; ok {
+		t.Fatal("stale default-lane detector lease (ec_balance) must still be pruned within its own lane")
+	}
+}
+
+func TestLaneStatus_LifecycleNextDetectionSurvivesDefaultLanePrune(t *testing.T) {
+	p, err := New(Options{})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	defer p.Shutdown()
+
+	now := time.Now().UTC()
+	expected := now.Add(24 * time.Hour)
+	p.schedulerMu.Lock()
+	p.nextDetectionAt["s3_lifecycle"] = expected
+	p.nextDetectionAt["vacuum"] = now.Add(time.Minute)
+	p.schedulerMu.Unlock()
+
+	p.pruneSchedulerState(LaneDefault, map[string]struct{}{"vacuum": {}})
+
+	status := p.GetLaneSchedulerStatus(LaneLifecycle)
+	if status.NextDetectionAt == nil {
+		t.Fatal("lifecycle lane status lost next_detection_at after a default-lane prune")
+	}
+	if !status.NextDetectionAt.Equal(expected) {
+		t.Fatalf("next_detection_at = %v, want %v (must be the 24h schedule, not the idle-sleep fallback)",
+			status.NextDetectionAt, expected)
+	}
+}