diff --git a/webui/src/pages/Task/QueuedSection.test.tsx b/webui/src/pages/Task/QueuedSection.test.tsx
index b468276e6..bdbc6ebf4 100644
--- a/webui/src/pages/Task/QueuedSection.test.tsx
+++ b/webui/src/pages/Task/QueuedSection.test.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { render, screen, waitFor } from '@testing-library/react';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 
@@ -21,6 +21,7 @@ const mocks = vi.hoisted(() => ({
   rerunExecution: vi.fn(),
   deleteExecution: vi.fn(),
   copyText: vi.fn().mockResolvedValue(undefined),
+  sessionChat: vi.fn(({ live }: { live?: boolean }) => <div>session-chat-live:{String(live)}</div>),
 }));
 
 vi.mock('react-i18next', () => ({
@@ -110,7 +111,7 @@ vi.mock('@/components/common/EmptyState', () => ({
 }));
 
 vi.mock('@/components/common/SessionChat', () => ({
-  default: () => <div>session-chat</div>,
+  default: (props: { live?: boolean }) => mocks.sessionChat(props),
 }));
 
 vi.mock('./components', () => ({
@@ -181,6 +182,7 @@ describe('QueuedSection', () => {
 
   beforeEach(() => {
     vi.clearAllMocks();
+    vi.useRealTimers();
     mocks.confirm.mockResolvedValue(true);
     mocks.useTaskExecutions.mockImplementation((params?: TaskListParams) => {
       const tasks = params?.status === 'completed' ? completedTasks : allTasks;
@@ -311,4 +313,88 @@ describe('QueuedSection', () => {
     expect(mocks.copyText).toHaveBeenCalledWith(expect.stringContaining('"keywords": "flocks agent"'));
     expect(mocks.toastSuccess).toHaveBeenCalled();
   });
+
+  it('带 session 的任务详情始终以 live 模式挂载 SessionChat', async () => {
+    const user = userEvent.setup();
+    const sessionTask = buildExecution(
+      'exec-session-live-1',
+      '会话任务',
+      'completed',
+      {
+        sessionID: 'ses-task-1',
+      },
+    );
+
+    mocks.useTaskExecutions.mockReturnValue({
+      tasks: [sessionTask],
+      total: 1,
+      loading: false,
+      error: null,
+      refetch: mocks.refetch,
+    });
+    mocks.getExecution.mockResolvedValue({ data: sessionTask });
+
+    render(<QueuedSection onRefreshGlobal={vi.fn()} />);
+
+    await user.click(screen.getByText('会话任务'));
+
+    expect(await screen.findByText('session-chat-live:true')).toBeInTheDocument();
+    expect(mocks.sessionChat).toHaveBeenLastCalledWith(
+      expect.objectContaining({
+        sessionId: 'ses-task-1',
+        live: true,
+        hideInput: true,
+      }),
+    );
+  });
+
+  it('详情抽屉打开后会按 execution id 轮询最新状态', async () => {
+    vi.useFakeTimers();
+    const staleCompletedTask = buildExecution(
+      'exec-poll-1',
+      '轮询任务',
+      'completed',
+      {
+        sessionID: 'ses-task-poll',
+      },
+    );
+    const runningTask = {
+      ...staleCompletedTask,
+      status: 'running' as const,
+      completedAt: undefined,
+    };
+
+    mocks.useTaskExecutions.mockReturnValue({
+      tasks: [staleCompletedTask],
+      total: 1,
+      loading: false,
+      error: null,
+      refetch: mocks.refetch,
+    });
+    mocks.getExecution
+      .mockResolvedValueOnce({ data: staleCompletedTask })
+      .mockResolvedValueOnce({ data: runningTask });
+
+    render(<QueuedSection onRefreshGlobal={vi.fn()} />);
+
+    fireEvent.click(screen.getByText('轮询任务'));
+
+    await act(async () => {
+      await Promise.resolve();
+    });
+
+    expect(screen.getAllByText('completed').length).toBeGreaterThan(0);
+
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(30000);
+    });
+
+    expect(mocks.getExecution).toHaveBeenCalledTimes(2);
+
+    await act(async () => {
+      await Promise.resolve();
+    });
+
+    expect(screen.getAllByText('running').length).toBeGreaterThan(1);
+  });
 });
diff --git a/webui/src/pages/Task/QueuedSection.tsx b/webui/src/pages/Task/QueuedSection.tsx
index ab5c467e2..68a33fc31 100644
--- a/webui/src/pages/Task/QueuedSection.tsx
+++ b/webui/src/pages/Task/QueuedSection.tsx
@@ -1,4 +1,4 @@
-import { useState, useEffect, useCallback, useRef } from 'react';
+import { useState, useEffect, useCallback, useMemo, useRef } from 'react';
 import { useTranslation } from 'react-i18next';
 import {
   ListTodo, Play, RotateCcw, XCircle, Trash2,
@@ -15,6 +15,8 @@ import { copyText } from '@/utils/clipboard';
 import { StatusBadge, PriorityBadge, SourceBadge, ModeBadge, ActionButton } from './components';
 import { formatTime, formatDuration, PAGE_SIZE } from './helpers';
 
+const DETAIL_POLL_INTERVAL_MS = 30000;
+
 export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: () => void }) {
   const { t } = useTranslation('task');
   const [filterKey, setFilterKey] = useState('all');
@@ -35,28 +37,33 @@ export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: ()
   const listParams = { ...currentFilter, offset: page * PAGE_SIZE, limit: PAGE_SIZE };
 
   const { tasks, total, loading, error, refetch } = useTaskExecutions(listParams, { pollInterval: 5000 });
+  const effectiveTasks = useMemo(() => {
+    if (!detailTask) return tasks;
+    return tasks.map((task) => (task.id === detailTask.id ? detailTask : task));
+  }, [tasks, detailTask]);
   const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE));
   const refresh = useCallback(() => { refetch(); onRefreshGlobal(); }, [refetch, onRefreshGlobal]);
-  const visibleSelectedIds = tasks
+  const visibleSelectedIds = effectiveTasks
     .filter(task => selectedTasks.has(task.id))
     .map(task => task.id);
   const hasVisibleSelection = visibleSelectedIds.length > 0;
-  const allVisibleSelected = tasks.length > 0 && tasks.every(task => selectedTasks.has(task.id));
+  const allVisibleSelected = effectiveTasks.length > 0 && effectiveTasks.every(task => selectedTasks.has(task.id));
 
   // Keep detailTask in sync: update from list data when available,
   // but never clear it just because the task left the current page.
   useEffect(() => {
     if (!selectedId) { setDetailTask(null); return; }
+    if (detailTask?.id === selectedId) return;
     const found = tasks.find(t => t.id === selectedId);
     if (found) setDetailTask(found);
-  }, [tasks, selectedId]);
+  }, [tasks, selectedId, detailTask?.id]);
 
   // Selection is scoped to the current visible list so users never batch
   // operate on hidden rows from a previous page or filter.
   useEffect(() => {
     setSelectedTasks(prev => {
       let changed = false;
-      const visibleIds = new Set(tasks.map(task => task.id));
+      const visibleIds = new Set(effectiveTasks.map(task => task.id));
       const next = new Set<string>();
       prev.forEach(id => {
         if (visibleIds.has(id)) {
@@ -67,7 +74,7 @@ export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: ()
       });
       return changed ? next : prev;
     });
-  }, [tasks]);
+  }, [effectiveTasks]);
 
   const markViewedIfNeeded = useCallback(async (task: TaskExecution) => {
     if (task.status !== 'completed' || task.deliveryStatus !== 'unread') {
@@ -101,6 +108,21 @@ export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: ()
     }
   }, [refresh, selectedId, fetchDetailTask]);
 
+  // The execution detail drawer must stay in sync even when the selected row
+  // disappears from the current list/filter (for example when a stale
+  // "completed" item becomes running again, or vice versa). Poll by ID while
+  // the drawer is open so the badge and SessionChat live-state reflect the
+  // latest backend truth instead of the last list snapshot.
+  useEffect(() => {
+    if (!selectedId) return;
+
+    const timerId = window.setInterval(() => {
+      void fetchDetailTask(selectedId);
+    }, DETAIL_POLL_INTERVAL_MS);
+
+    return () => window.clearInterval(timerId);
+  }, [selectedId, fetchDetailTask]);
+
   const closeDetail = useCallback(() => {
     setSelectedId(null);
     setDetailTask(null);
@@ -191,9 +213,9 @@ export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: ()
     setSelectedTasks(prev => {
       const next = new Set(prev);
       if (allVisibleSelected) {
-        tasks.forEach(task => next.delete(task.id));
+        effectiveTasks.forEach(task => next.delete(task.id));
       } else {
-        tasks.forEach(task => next.add(task.id));
+        effectiveTasks.forEach(task => next.add(task.id));
       }
       return next;
     });
@@ -211,7 +233,7 @@ export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: ()
     setSelectedTasks(new Set());
   };
 
-  if (loading && tasks.length === 0) return <div className="flex justify-center py-12"><LoadingSpinner /></div>;
+  if (loading && effectiveTasks.length === 0) return <div className="flex justify-center py-12"><LoadingSpinner /></div>;
   if (error) return <div className="text-center py-12 text-red-500">{error}</div>;
 
   return (
@@ -240,7 +262,7 @@ export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: ()
       </div>
 
       <div className="bg-white rounded-xl border border-gray-200 overflow-hidden">
-        {tasks.length === 0 ? (
+        {effectiveTasks.length === 0 ? (
           <EmptyState
             icon={<ListTodo className="w-8 h-8" />}
             title={t('queued.emptyTitle')}
@@ -268,7 +290,7 @@ export default function QueuedSection({ onRefreshGlobal }: { onRefreshGlobal: ()
                 </tr>
               </thead>
               <tbody className="divide-y divide-gray-100">
-                {tasks.map(task => (
+                {effectiveTasks.map(task => (
                   <tr
                     key={task.id}
                     onClick={() => openDetail(task)}
@@ -333,8 +355,8 @@ function QueuedDetailPanel({ task, onClose, onAction, onRefresh }: {
   const DRAWER_MAX_WIDTH = 960;
   const { t } = useTranslation('task');
   const sessionId = task.sessionID;
-  const isActive = ['queued', 'running'].includes(task.status);
   const isWorkflowExecution = task.executionMode === 'workflow';
+  const shouldStreamSession = Boolean(sessionId);
   const emptyText = ['pending', 'queued'].includes(task.status)
     ? t('queued.detailWaiting')
     : t('queued.detailNoRecord');
@@ -434,7 +456,7 @@ function QueuedDetailPanel({ task, onClose, onAction, onRefresh }: {
         ) : (
           <SessionChat
             sessionId={sessionId}
-            live={isActive}
+            live={shouldStreamSession}
             hideInput
             emptyText={emptyText}
             className="flex-1 min-h-0"