diff --git a/extensions/feishu/src/bot.test.ts b/extensions/feishu/src/bot.test.ts
index 1cf1dc6c3c3f..c7dc258378df 100644
--- a/extensions/feishu/src/bot.test.ts
+++ b/extensions/feishu/src/bot.test.ts
@@ -8,6 +8,7 @@ import type { ClawdbotConfig, PluginRuntime } from "../runtime-api.js";
 import { parseMergeForwardContent } from "./bot-content.js";
 import type { FeishuMessageEvent } from "./bot.js";
 import { handleFeishuMessage } from "./bot.js";
+import { resolveFeishuMessageDedupeKey } from "./dedupe-key.js";
 import { createFeishuMessageReceiveHandler } from "./monitor.message-handler.js";
 import { setFeishuRuntime } from "./runtime.js";
 
@@ -4166,6 +4167,70 @@ describe("handleFeishuMessage command authorization", () => {
 });
 
 describe("createFeishuMessageReceiveHandler media dedupe", () => {
+  it("preserves the original dispatch dedupe key when debounce merges text content", async () => {
+    const handleMessage = vi.fn(async () => undefined);
+    const core = {
+      channel: {
+        debounce: {
+          resolveInboundDebounceMs: vi.fn(() => 10),
+          createInboundDebouncer: vi.fn(
+            (options: { onFlush: (entries: FeishuMessageEvent[]) => Promise<void> | void }) => {
+              const entries: FeishuMessageEvent[] = [];
+              return {
+                enqueue: async (event: FeishuMessageEvent) => {
+                  entries.push(event);
+                  if (entries.length === 2) {
+                    await options.onFlush(entries);
+                  }
+                },
+              };
+            },
+          ),
+        },
+        commands: {
+          isControlCommandMessage: vi.fn(() => false),
+        },
+      },
+    } as unknown as PluginRuntime;
+    const createTextEvent = (messageId: string, createTime: string, text: string) =>
+      ({
+        sender: { sender_id: { open_id: "ou-text-debounce" } },
+        message: {
+          message_id: messageId,
+          chat_id: "oc-dm",
+          chat_type: "p2p",
+          message_type: "text",
+          content: JSON.stringify({ text }),
+          create_time: createTime,
+        },
+      }) satisfies FeishuMessageEvent;
+    const last = createTextEvent("msg-text-last", "1710000001000", "second");
+    const handler = createFeishuMessageReceiveHandler({
+      cfg: { channels: { feishu: { dmPolicy: "open" } } } as ClawdbotConfig,
+      channelRuntime: core.channel,
+      accountId: "receive-text-debounce",
+      chatHistories: new Map(),
+      handleMessage,
+      resolveDebounceText: ({ event }) =>
+        (JSON.parse(event.message.content) as { text: string }).text,
+      hasProcessedMessage: vi.fn(async () => false),
+      recordProcessedMessage: vi.fn(async () => true),
+    });
+
+    await handler(createTextEvent("msg-text-first", "1710000000000", "first"));
+    await handler(last);
+
+    const call = mockCallArg<{
+      event?: FeishuMessageEvent;
+      messageDedupeKey?: string;
+    }>(handleMessage, 0, 0);
+    expect(call.event?.message.content).toBe(JSON.stringify({ text: "first\nsecond" }));
+    expect(call.messageDedupeKey).toBe(resolveFeishuMessageDedupeKey(last));
+    expect(resolveFeishuMessageDedupeKey(call.event as FeishuMessageEvent)).not.toBe(
+      call.messageDedupeKey,
+    );
+  });
+
   it("keeps same-id media variants distinct at receive time", async () => {
     const handleMessage = vi.fn(async () => undefined);
     const core = {
diff --git a/extensions/feishu/src/bot.ts b/extensions/feishu/src/bot.ts
index 8053f472c78d..abcf535ce436 100644
--- a/extensions/feishu/src/bot.ts
+++ b/extensions/feishu/src/bot.ts
@@ -466,6 +466,7 @@ export async function handleFeishuMessage(params: {
   chatHistories?: Map<string, HistoryEntry[]>;
   accountId?: string;
   processingClaimHeld?: boolean;
+  messageDedupeKey?: string;
 }): Promise<void> {
   const {
     cfg,
@@ -477,6 +478,7 @@ export async function handleFeishuMessage(params: {
     chatHistories,
     accountId,
     processingClaimHeld = false,
+    messageDedupeKey: messageDedupeKeyOverride,
   } = params;
 
   // Resolve account with merged config
@@ -487,7 +489,7 @@ export async function handleFeishuMessage(params: {
   const error = runtime?.error ?? console.error;
 
   const messageId = event.message.message_id;
-  const messageDedupeKey = resolveFeishuMessageDedupeKey(event);
+  const messageDedupeKey = messageDedupeKeyOverride ?? resolveFeishuMessageDedupeKey(event);
   if (
     !(await finalizeFeishuMessageProcessing({
       messageId: messageDedupeKey,
diff --git a/extensions/feishu/src/monitor.message-handler.ts b/extensions/feishu/src/monitor.message-handler.ts
index e584ac61809a..7961e648d861 100644
--- a/extensions/feishu/src/monitor.message-handler.ts
+++ b/extensions/feishu/src/monitor.message-handler.ts
@@ -28,6 +28,7 @@ type FeishuMessageReceiveHandlerContext = {
     chatHistories?: Map<string, HistoryEntry[]>;
     accountId?: string;
     processingClaimHeld?: boolean;
+    messageDedupeKey?: string;
   }) => Promise<void>;
   resolveDebounceText: (params: {
     event: FeishuMessageEvent;
@@ -184,7 +185,7 @@ export function createFeishuMessageReceiveHandler({
     },
   });
 
-  const dispatchFeishuMessage = async (event: FeishuMessageEvent) => {
+  const dispatchFeishuMessage = async (event: FeishuMessageEvent, messageDedupeKey?: string) => {
     const sequentialKey = resolveSequentialKey({
       accountId,
       event,
@@ -202,6 +203,7 @@ export function createFeishuMessageReceiveHandler({
         chatHistories,
         accountId,
         processingClaimHeld: true,
+        messageDedupeKey,
       });
     await enqueue(sequentialKey, task);
   };
@@ -266,7 +268,7 @@ export function createFeishuMessageReceiveHandler({
         return;
       }
       if (entries.length === 1) {
-        await dispatchFeishuMessage(last);
+        await dispatchFeishuMessage(last, resolveFeishuMessageDedupeKey(last));
         return;
       }
       const dedupedEntries = dedupeFeishuDebounceEntriesByDedupeKey(entries);
@@ -280,10 +282,8 @@ export function createFeishuMessageReceiveHandler({
       if (!dispatchEntry) {
         return;
       }
-      await recordSuppressedMessageIds(
-        dedupedEntries,
-        resolveFeishuMessageDedupeKey(dispatchEntry),
-      );
+      const dispatchDedupeKey = resolveFeishuMessageDedupeKey(dispatchEntry);
+      await recordSuppressedMessageIds(dedupedEntries, dispatchDedupeKey);
       const combinedText = freshEntries
         .map((entry) => resolveDebounceText(entry))
         .filter(Boolean)
@@ -292,19 +292,22 @@ export function createFeishuMessageReceiveHandler({
         entries: freshEntries,
         botOpenId: getBotOpenId(accountId),
       });
-      await dispatchFeishuMessage({
-        ...dispatchEntry,
-        message: {
-          ...dispatchEntry.message,
-          ...(combinedText.trim()
-            ? {
-                message_type: "text",
-                content: JSON.stringify({ text: combinedText }),
-              }
-            : {}),
-          mentions: mergedMentions ?? dispatchEntry.message.mentions,
+      await dispatchFeishuMessage(
+        {
+          ...dispatchEntry,
+          message: {
+            ...dispatchEntry.message,
+            ...(combinedText.trim()
+              ? {
+                  message_type: "text",
+                  content: JSON.stringify({ text: combinedText }),
+                }
+              : {}),
+            mentions: mergedMentions ?? dispatchEntry.message.mentions,
+          },
         },
-      });
+        dispatchDedupeKey,
+      );
     },
     onError: (err, entries) => {
       for (const entry of entries) {