diff --git a/src/components/image-editor/ImageCanvasTaskSidebarView.test.tsx b/src/components/image-editor/ImageCanvasTaskSidebarView.test.tsx
index cb008fdac..d8640f038 100644
--- a/src/components/image-editor/ImageCanvasTaskSidebarView.test.tsx
+++ b/src/components/image-editor/ImageCanvasTaskSidebarView.test.tsx
@@ -172,45 +172,45 @@ describe('ImageCanvasTaskSidebarView', () => {
     const completedAt = new Date(Date.now() - 20_000).toISOString();
     listExternalGenerationTasksMock.mockImplementation(
       (options: Parameters<typeof listExternalGenerationTasks>[0] = {}) =>
-      Promise.resolve({
-        overview: {
-          pendingCount: 0,
-          runningCount: 1,
-          unacknowledgedTerminalCount: 1,
-          updatedAtMicros: 1,
-        },
-        tasks: options.statuses?.includes('running')
-          ? [
-              createExternalTask({
-                jobId: 'active-current',
-                startedAt,
-              }),
-              createExternalTask({
-                jobId: 'active-other-project',
-                sourceEntityId: 'project-other',
-                requestPrompt: '不该显示的外部项目任务',
-              }),
-            ]
-          : [
-              createExternalTask({
-                jobId: 'done-current',
-                status: 'completed',
-                requestPrompt: '已完成提示词',
-                startedAt: new Date(Date.now() - 90_000).toISOString(),
-                completedAt,
-                updatedAt: completedAt,
-                progress: 100,
-                phaseDetail: '生成已完成。',
-              }),
-              createExternalTask({
-                jobId: 'done-other-project',
-                sourceEntityId: 'project-other',
-                status: 'completed',
-                requestPrompt: '另一个项目的已完成任务',
-                completedAt,
-              }),
-            ],
-      }),
+        Promise.resolve({
+          overview: {
+            pendingCount: 0,
+            runningCount: 1,
+            unacknowledgedTerminalCount: 1,
+            updatedAtMicros: 1,
+          },
+          tasks: options.statuses?.includes('running')
+            ? [
+                createExternalTask({
+                  jobId: 'active-current',
+                  startedAt,
+                }),
+                createExternalTask({
+                  jobId: 'active-other-project',
+                  sourceEntityId: 'project-other',
+                  requestPrompt: '不该显示的外部项目任务',
+                }),
+              ]
+            : [
+                createExternalTask({
+                  jobId: 'done-current',
+                  status: 'completed',
+                  requestPrompt: '已完成提示词',
+                  startedAt: new Date(Date.now() - 90_000).toISOString(),
+                  completedAt,
+                  updatedAt: completedAt,
+                  progress: 100,
+                  phaseDetail: '生成已完成。',
+                }),
+                createExternalTask({
+                  jobId: 'done-other-project',
+                  sourceEntityId: 'project-other',
+                  status: 'completed',
+                  requestPrompt: '另一个项目的已完成任务',
+                  completedAt,
+                }),
+              ],
+        }),
     );
 
     render(
@@ -237,4 +237,56 @@ describe('ImageCanvasTaskSidebarView', () => {
     expect(screen.getByText(/完成于/u)).toBeTruthy();
     expect(screen.queryByText(/另一个项目的已完成任务/u)).toBeNull();
   });
+
+  it('keeps the empty active tab selected after manual tab click', async () => {
+    const completedAt = new Date(Date.now() - 20_000).toISOString();
+    listExternalGenerationTasksMock.mockImplementation(
+      (options: Parameters<typeof listExternalGenerationTasks>[0] = {}) =>
+        Promise.resolve({
+          overview: {
+            pendingCount: 0,
+            runningCount: 0,
+            unacknowledgedTerminalCount: 1,
+            updatedAtMicros: 1,
+          },
+          tasks: options.statuses?.includes('running')
+            ? []
+            : [
+                createExternalTask({
+                  jobId: 'done-current',
+                  status: 'completed',
+                  requestPrompt: '已完成提示词',
+                  completedAt,
+                  updatedAt: completedAt,
+                }),
+              ],
+        }),
+    );
+
+    render(
+      <ImageCanvasTaskSidebarView
+        projectId="project-1"
+        generationDialogs={[]}
+        backgroundRemovalTasks={[]}
+        open
+        onToggleOpen={vi.fn()}
+        onFocusGenerationDialog={vi.fn()}
+        onFocusLayer={vi.fn()}
+        onFocusExternalTask={vi.fn()}
+      />,
+    );
+
+    await screen.findByText('暂无任务');
+    const activeTab = screen.getByRole('tab', { name: /排队\/生成中/u });
+    const completedTab = screen.getByRole('tab', { name: /已完成/u });
+
+    fireEvent.click(completedTab);
+    expect(await screen.findByText(/已完成提示词/u)).toBeTruthy();
+
+    fireEvent.click(activeTab);
+
+    expect(activeTab.getAttribute('aria-selected')).toBe('true');
+    expect(screen.getByText('暂无任务')).toBeTruthy();
+    expect(screen.queryByText(/已完成提示词/u)).toBeNull();
+  });
 });
diff --git a/src/components/image-editor/ImageCanvasTaskSidebarView.tsx b/src/components/image-editor/ImageCanvasTaskSidebarView.tsx
index ae936f9d6..464e6e1c4 100644
--- a/src/components/image-editor/ImageCanvasTaskSidebarView.tsx
+++ b/src/components/image-editor/ImageCanvasTaskSidebarView.tsx
@@ -555,15 +555,9 @@ export function ImageCanvasTaskSidebarView({
     const previousActiveItemCount = previousActiveItemCountRef.current;
     if (activeItems.length > previousActiveItemCount) {
       setActiveTab('active');
-    } else if (
-      activeItems.length === 0 &&
-      activeTab === 'active' &&
-      completedItems.length > 0
-    ) {
-      setActiveTab('completed');
     }
     previousActiveItemCountRef.current = activeItems.length;
-  }, [activeItems.length, activeTab, completedItems.length]);
+  }, [activeItems.length]);
 
   const visibleItems = activeTab === 'active' ? activeItems : completedItems;