diff --git a/crates/ecstore/src/store/mod.rs b/crates/ecstore/src/store/mod.rs
index c401c8636..fc24ec023 100644
--- a/crates/ecstore/src/store/mod.rs
+++ b/crates/ecstore/src/store/mod.rs
@@ -1431,9 +1431,29 @@ mod tests {
             .await
             .expect("movement writer should proceed after lease expiry")
             .expect("expiry writer task should not panic");
+        assert!(
+            store.validate_scanner_publication_lease(expiring_token, 0).await.is_err(),
+            "an expired lease must not validate after its read guard is released"
+        );
         assert!(!store.release_scanner_publication_lease(expiring_token).await);
     }
 
+    #[tokio::test]
+    async fn scanner_publication_lease_rejects_a_new_movement_generation() {
+        let store = build_store_with_ctx(Arc::new(InstanceContext::new()));
+        let (token, generation) = store
+            .acquire_scanner_publication_lease(0, crate::runtime::instance::SCANNER_PUBLICATION_LEASE_TTL)
+            .await
+            .expect("an idle store should grant a publication lease");
+
+        assert_eq!(store.ctx.advance_data_movement_generation(), Some(1));
+        assert!(
+            store.validate_scanner_publication_lease(token, generation).await.is_err(),
+            "a lease from the prior movement generation must fail closed"
+        );
+        assert!(store.release_scanner_publication_lease(token).await);
+    }
+
     #[tokio::test]
     async fn scanner_publication_lease_rejects_stale_generation_before_install() {
         let store = build_store_with_ctx(Arc::new(InstanceContext::new()));
diff --git a/crates/scanner/src/scanner/tests.rs b/crates/scanner/src/scanner/tests.rs
index 1aae284ee..49af15397 100644
--- a/crates/scanner/src/scanner/tests.rs
+++ b/crates/scanner/src/scanner/tests.rs
@@ -352,6 +352,7 @@ struct MemoryConfigStore {
     objects: Mutex<HashMap<String, Vec<u8>>>,
     revisions: Mutex<HashMap<String, u64>>,
     insert_after_gets: Mutex<HashMap<String, Vec<u8>>>,
+    delayed_gets: Mutex<HashMap<String, Duration>>,
     non_regular_objects: Mutex<HashSet<String>>,
     fail_put_number: Mutex<HashMap<String, usize>>,
     object_not_found_put_number: Mutex<HashMap<String, usize>>,
@@ -399,6 +400,9 @@ impl crate::storage_api::scanner_io::ObjectIO for MemoryConfigStore {
         _opts: &ObjectOptions,
     ) -> EcstoreResult<GetObjectReader> {
         let key = memory_config_key(bucket, object);
+        if let Some(delay) = self.delayed_gets.lock().await.remove(&key) {
+            tokio::time::sleep(delay).await;
+        }
         let inserted_data = self.insert_after_gets.lock().await.remove(&key);
         let data = {
             let mut objects = self.objects.lock().await;
@@ -3532,6 +3536,47 @@ async fn coordinator_classifies_an_expired_publication_lease() {
     assert!(store.put_counts.lock().await.is_empty(), "expired lease must prevent a PUT");
 }
 
+#[tokio::test]
+async fn backup_sync_checks_the_lease_deadline_after_a_slow_backup_read() {
+    let store = Arc::new(MemoryConfigStore::default());
+    let primary_path = DATA_USAGE_OBJ_NAME_PATH.as_str();
+    let backup_path = format!("{primary_path}.bkp");
+    let primary_key = memory_config_key(RUSTFS_META_BUCKET, primary_path);
+    let backup_key = memory_config_key(RUSTFS_META_BUCKET, &backup_path);
+    let primary = complete_usage_with_bucket_count(Some(std::time::SystemTime::UNIX_EPOCH), 0);
+    store
+        .objects
+        .lock()
+        .await
+        .insert(primary_key, serde_json::to_vec(&primary).expect("primary usage snapshot should encode"));
+    store
+        .delayed_gets
+        .lock()
+        .await
+        .insert(backup_key.clone(), Duration::from_millis(20));
+
+    // The primary read is allowed to start, but the backup read consumes the
+    // remaining lease window. The second deadline check must prevent a stale
+    // backup PUT after that window has elapsed.
+    let deadline = std::time::Instant::now()
+        .checked_add(std::time::Duration::from_millis(5))
+        .expect("test deadline should support a five-millisecond window");
+    let result = sync_data_usage_backup_from_primary_for_epoch_and_lease_and_fence(
+        &CancellationToken::new(),
+        store.clone(),
+        None,
+        Some(deadline),
+        None,
+    )
+    .await;
+
+    assert!(scanner_publication_epoch_changed(
+        &result.expect_err("an expired backup lease must defer publication")
+    ));
+    assert!(!store.objects.lock().await.contains_key(&backup_key));
+    assert_eq!(store.put_counts.lock().await.get(&backup_key), None);
+}
+
 #[tokio::test]
 #[serial]
 async fn test_deferred_usage_save_keeps_last_real_save_metric() {
@@ -4807,6 +4852,29 @@ async fn data_usage_persist_wait_aborts_after_timeout() {
     assert!(task.is_finished());
 }
 
+#[tokio::test(start_paused = true)]
+async fn data_usage_persist_timeout_drops_owned_task_without_a_late_commit() {
+    let ctx = CancellationToken::new();
+    let commit_started = Arc::new(AtomicBool::new(false));
+    let commit_started_by_task = commit_started.clone();
+    let task_ready = Arc::new(tokio::sync::Notify::new());
+    let task_ready_by_task = task_ready.clone();
+    let mut task = AbortOnDropHandle::new(tokio::spawn(async move {
+        task_ready_by_task.notify_one();
+        std::future::pending::<()>().await;
+        commit_started_by_task.store(true, Ordering::Release);
+        DataUsagePersistOutcome::Saved
+    }));
+    task_ready.notified().await;
+
+    let result = wait_for_data_usage_persist_task(&ctx, &mut task, Duration::from_secs(1)).await;
+
+    assert!(matches!(result, DataUsagePersistTaskResult::TimedOut));
+    assert!(task.is_finished(), "the timed-out persistence task must be drained before return");
+    tokio::task::yield_now().await;
+    assert!(!commit_started.load(Ordering::Acquire), "an owned task must not commit after its timeout");
+}
+
 #[tokio::test(start_paused = true)]
 async fn maintenance_feature_inspection_preserves_base_cycle_after_timeout() {
     let ctx = CancellationToken::new();