diff --git a/wechat-mp.mjs b/wechat-mp.mjs
index 74f05a4..529b409 100644
--- a/wechat-mp.mjs
+++ b/wechat-mp.mjs
@@ -1984,6 +1984,7 @@ export function createWechatMpService({
     userId,
     openid,
     forceNew = false,
+    retainUnlinkedRoute = false,
     userContext = null,
   }) => {
     if (forceNew) {
@@ -2045,8 +2046,10 @@ export function createWechatMpService({
         snapshotMessageCount: routeSnapshotMessageCount,
         now,
       });
-      if (routeIsIdle || routeIsTooLong || routeHasUnlinkedConversation) {
-        if (routeHasUnlinkedConversation) {
+      const shouldRotateUnlinkedRoute =
+        routeHasUnlinkedConversation && !retainUnlinkedRoute;
+      if (routeIsIdle || routeIsTooLong || shouldRotateUnlinkedRoute) {
+        if (shouldRotateUnlinkedRoute) {
           logger.warn?.('WeChat MP orphaned route rotated before reuse:', {
             agentSessionId: existingRoute.agentSessionId,
             snapshotMessageCount: routeSnapshotMessageCount,
@@ -2439,6 +2442,7 @@ export function createWechatMpService({
       openid: inbound.fromUserName,
       userContext: user,
       forceNew,
+      retainUnlinkedRoute: immediateContextFollowup,
     });
     let sessionId = route.sessionId;
     await ensureSessionProvider(sessionId);
diff --git a/wechat-mp.test.mjs b/wechat-mp.test.mjs
index 61511b3..c6278df 100644
--- a/wechat-mp.test.mjs
+++ b/wechat-mp.test.mjs
@@ -358,6 +358,73 @@ test('WeChat immediate-context page guard does not match complete page requests'
   assert.doesNotMatch(ordinaryPrompt, /即时上下文优先/);
 });
 
+test('WeChat immediate-context page retains an unlinked route with adjacent snapshot', async () => {
+  const clearedRoutes = [];
+  const startedSessions = [];
+  let activeRoute = {
+    agentSessionId: 'session-poem',
+    updatedAt: Date.now() - 120_000,
+  };
+  const service = createBoundWechatService({
+    config: {
+      sessionMessageRotateCount: 0,
+      sessionIdleRotateMs: 0,
+    },
+    userAuth: {
+      async getWechatAgentRoute() {
+        return activeRoute;
+      },
+      async clearWechatAgentRoute(_appId, openid) {
+        clearedRoutes.push(openid);
+        activeRoute = null;
+      },
+      async countWechatAgentSessionMessages() {
+        return 0;
+      },
+      async getWechatAgentSessionSnapshotMessageCount() {
+        return 5;
+      },
+      async touchWechatAgentRoute(_appId, _openid, updatedAt) {
+        activeRoute = { ...activeRoute, updatedAt };
+      },
+    },
+    startAgentSession: async (sessionId) => {
+      startedSessions.push(sessionId);
+      return sessionId;
+    },
+    sessionApiFetch: async (pathname) => {
+      if (String(pathname).includes('/tools')) {
+        return new Response(JSON.stringify({ tools: [] }), {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+      }
+      return new Response(JSON.stringify({ conversation: [] }), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      });
+    },
+    submitSessionReply: async () => ({
+      ok: true,
+      conversation: [{ role: 'assistant', content: [{ type: 'text', text: 'ok' }] }],
+    }),
+  });
+
+  const timestamp = '1710000000';
+  const nonce = 'nonce-immediate-context-route';
+  await service.handleInboundMessage(
+    inboundXml({ content: '把刚才的诗做成页面' }),
+    {
+      timestamp,
+      nonce,
+      signature: signatureFor('token', timestamp, nonce),
+    },
+  );
+
+  assert.equal(clearedRoutes.length, 0);
+  assert.equal(startedSessions.length, 0);
+});
+
 test('WeChat only rotates an aged route with conversation but no linked inbound message', () => {
   const now = 200_000;
   assert.equal(