diff --git a/extensions/telegram/src/bot-handlers.debounce-key.ts b/extensions/telegram/src/bot-handlers.debounce-key.ts
index 530230cc1f8..de1aa55ac5f 100644
--- a/extensions/telegram/src/bot-handlers.debounce-key.ts
+++ b/extensions/telegram/src/bot-handlers.debounce-key.ts
@@ -7,3 +7,12 @@ export function buildTelegramInboundDebounceKey(params: {
   const resolvedAccountId = params.accountId?.trim() || "default";
   return `telegram:${resolvedAccountId}:${params.conversationKey}:${params.senderId}:${params.debounceLane}`;
 }
+
+export function buildTelegramInboundDebounceConversationKey(params: {
+  chatId: number | string;
+  threadId?: number | null;
+}): string {
+  return params.threadId != null
+    ? `${params.chatId}:topic:${params.threadId}`
+    : String(params.chatId);
+}
diff --git a/extensions/telegram/src/bot-handlers.runtime.test.ts b/extensions/telegram/src/bot-handlers.runtime.test.ts
index 08d2c6ef6c8..2a9ea1195a5 100644
--- a/extensions/telegram/src/bot-handlers.runtime.test.ts
+++ b/extensions/telegram/src/bot-handlers.runtime.test.ts
@@ -1,5 +1,8 @@
 import { describe, expect, it } from "vitest";
-import { buildTelegramInboundDebounceKey } from "./bot-handlers.debounce-key.js";
+import {
+  buildTelegramInboundDebounceConversationKey,
+  buildTelegramInboundDebounceKey,
+} from "./bot-handlers.debounce-key.js";
 
 describe("buildTelegramInboundDebounceKey", () => {
   it("uses the resolved account id instead of literal default when provided", () => {
@@ -23,4 +26,31 @@ describe("buildTelegramInboundDebounceKey", () => {
       }),
     ).toBe("telegram:default:12345:67890:forward");
   });
+
+  it("keeps direct topic thread ids in the conversation key", () => {
+    const topic100 = buildTelegramInboundDebounceConversationKey({ chatId: 7, threadId: 100 });
+    const topic200 = buildTelegramInboundDebounceConversationKey({ chatId: 7, threadId: 200 });
+
+    expect(topic100).toBe("7:topic:100");
+    expect(topic200).toBe("7:topic:200");
+    expect(
+      buildTelegramInboundDebounceKey({
+        accountId: "default",
+        conversationKey: topic100,
+        senderId: "42",
+        debounceLane: "default",
+      }),
+    ).not.toBe(
+      buildTelegramInboundDebounceKey({
+        accountId: "default",
+        conversationKey: topic200,
+        senderId: "42",
+        debounceLane: "default",
+      }),
+    );
+  });
+
+  it("uses the chat id as the conversation key when no thread is present", () => {
+    expect(buildTelegramInboundDebounceConversationKey({ chatId: 7 })).toBe("7");
+  });
 });
diff --git a/extensions/telegram/src/bot-handlers.runtime.ts b/extensions/telegram/src/bot-handlers.runtime.ts
index 2d6c5a2cd92..62b00ad8630 100644
--- a/extensions/telegram/src/bot-handlers.runtime.ts
+++ b/extensions/telegram/src/bot-handlers.runtime.ts
@@ -43,7 +43,10 @@ import {
   resolveDefaultAgentId,
   resolveDefaultModelForAgent,
 } from "./bot-handlers.agent.runtime.js";
-import { buildTelegramInboundDebounceKey } from "./bot-handlers.debounce-key.js";
+import {
+  buildTelegramInboundDebounceConversationKey,
+  buildTelegramInboundDebounceKey,
+} from "./bot-handlers.debounce-key.js";
 import {
   hasInboundMedia,
   hasReplyTargetMedia,
@@ -1165,9 +1168,10 @@ export const registerTelegramHandlers = ({
         ]
       : [];
     const senderId = msg.from?.id ? String(msg.from.id) : "";
-    const conversationThreadId = resolvedThreadId ?? dmThreadId;
-    const conversationKey =
-      conversationThreadId != null ? `${chatId}:topic:${conversationThreadId}` : String(chatId);
+    const conversationKey = buildTelegramInboundDebounceConversationKey({
+      chatId,
+      threadId: resolvedThreadId ?? dmThreadId,
+    });
     const debounceLane = resolveTelegramDebounceLane(msg);
     const debounceKey = senderId
       ? buildTelegramInboundDebounceKey({
diff --git a/extensions/telegram/src/bot.test.ts b/extensions/telegram/src/bot.test.ts
index 1e64cd8fc7c..854df5e15bd 100644
--- a/extensions/telegram/src/bot.test.ts
+++ b/extensions/telegram/src/bot.test.ts
@@ -1676,89 +1676,6 @@ describe("createTelegramBot", () => {
     }
   });
 
-  it("isolates inbound debounce by DM topic thread id", async () => {
-    const DEBOUNCE_MS = 4321;
-    onSpy.mockClear();
-    replySpy.mockClear();
-    loadConfig.mockReturnValue({
-      agents: {
-        defaults: {
-          envelopeTimezone: "utc",
-        },
-      },
-      messages: {
-        inbound: {
-          debounceMs: DEBOUNCE_MS,
-        },
-      },
-      channels: {
-        telegram: {
-          dmPolicy: "open",
-          allowFrom: ["*"],
-        },
-      },
-    });
-
-    const setTimeoutSpy = vi.spyOn(globalThis, "setTimeout");
-    try {
-      const repliesDelivered = waitForReplyCalls(2);
-      createTelegramBot({ token: "tok" });
-      const handler = getOnHandler("message") as (ctx: Record<string, unknown>) => Promise<void>;
-
-      await handler({
-        message: {
-          chat: { id: 7, type: "private" },
-          text: "topic-100",
-          date: 1736380800,
-          message_id: 201,
-          message_thread_id: 100,
-          from: { id: 42, first_name: "Ada" },
-        },
-        me: { username: "openclaw_bot" },
-        getFile: async () => ({}),
-      });
-      await handler({
-        message: {
-          chat: { id: 7, type: "private" },
-          text: "topic-200",
-          date: 1736380801,
-          message_id: 202,
-          message_thread_id: 200,
-          from: { id: 42, first_name: "Ada" },
-        },
-        me: { username: "openclaw_bot" },
-        getFile: async () => ({}),
-      });
-
-      expect(replySpy).not.toHaveBeenCalled();
-
-      const debounceTimerIndexes = setTimeoutSpy.mock.calls
-        .map((call, index) => ({ index, delay: call[1] }))
-        .filter((entry) => entry.delay === DEBOUNCE_MS)
-        .map((entry) => entry.index);
-      expect(debounceTimerIndexes.length).toBeGreaterThanOrEqual(2);
-
-      for (const index of debounceTimerIndexes) {
-        clearTimeout(setTimeoutSpy.mock.results[index]?.value as ReturnType<typeof setTimeout>);
-      }
-      for (const index of debounceTimerIndexes) {
-        const flushTimer = setTimeoutSpy.mock.calls[index]?.[0] as (() => unknown) | undefined;
-        await flushTimer?.();
-      }
-
-      await repliesDelivered;
-      const threadIds = replySpy.mock.calls
-        .map(
-          (call: [unknown, ...unknown[]]) =>
-            (call[0] as { MessageThreadId?: number }).MessageThreadId,
-        )
-        .toSorted((a: number | undefined, b: number | undefined) => (a ?? 0) - (b ?? 0));
-      expect(threadIds).toEqual([100, 200]);
-    } finally {
-      setTimeoutSpy.mockRestore();
-    }
-  });
-
   it("handles quote-only replies without reply metadata", async () => {
     onSpy.mockClear();
     sendMessageSpy.mockClear();