diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a68c376933..c6819e29a08 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -95,6 +95,7 @@ Status: beta.
 - Agents: release session locks on process termination and cover more signals. (#2483) Thanks @janeexai.
 - Agents: skip cooldowned providers during model failover. (#2143) Thanks @YiWang24.
 - Telegram: harden polling + retry behavior for transient network errors and Node 22 transport issues. (#2420) Thanks @techboss.
+- Telegram: ignore non-forum group message_thread_id while preserving DM thread sessions. (#2731) Thanks @dylanneve1.
 - Telegram: wrap reasoning italics per line to avoid raw underscores. (#2181) Thanks @YuriNachos.
 - Telegram: centralize API error logging for delivery and bot calls. (#2492) Thanks @altryne.
 - Voice Call: enforce Twilio webhook signature verification for ngrok URLs; disable ngrok free tier bypass by default.
diff --git a/src/telegram/bot-native-commands.ts b/src/telegram/bot-native-commands.ts
index 6b8bfba01ed..3415ea9271b 100644
--- a/src/telegram/bot-native-commands.ts
+++ b/src/telegram/bot-native-commands.ts
@@ -360,6 +360,8 @@ export const registerTelegramNativeCommands = ({
             topicConfig,
             commandAuthorized,
           } = auth;
+          const messageThreadId = (msg as { message_thread_id?: number }).message_thread_id;
+          const threadIdForSend = isGroup ? resolvedThreadId : messageThreadId;
 
           const commandDefinition = findCommandByNativeName(command.name, "telegram");
           const rawText = ctx.match?.trim() ?? "";
@@ -406,7 +408,7 @@ export const registerTelegramNativeCommands = ({
               fn: () =>
                 bot.api.sendMessage(chatId, title, {
                   ...(replyMarkup ? { reply_markup: replyMarkup } : {}),
-                  ...(resolvedThreadId != null ? { message_thread_id: resolvedThreadId } : {}),
+                  ...(threadIdForSend != null ? { message_thread_id: threadIdForSend } : {}),
                 }),
             });
             return;
@@ -467,7 +469,7 @@ export const registerTelegramNativeCommands = ({
             CommandSource: "native" as const,
             SessionKey: `telegram:slash:${senderId || chatId}`,
             CommandTargetSessionKey: sessionKey,
-            MessageThreadId: resolvedThreadId,
+            MessageThreadId: threadIdForSend,
             IsForum: isForum,
             // Originating context for sub-agent announce routing
             OriginatingChannel: "telegram" as const,
@@ -494,7 +496,7 @@ export const registerTelegramNativeCommands = ({
                   bot,
                   replyToMode,
                   textLimit,
-                  messageThreadId: resolvedThreadId,
+                  messageThreadId: threadIdForSend,
                   tableMode,
                   chunkMode,
                   linkPreview: telegramCfg.linkPreview,
@@ -542,7 +544,9 @@ export const registerTelegramNativeCommands = ({
             requireAuth: match.command.requireAuth !== false,
           });
           if (!auth) return;
-          const { resolvedThreadId, senderId, commandAuthorized } = auth;
+          const { resolvedThreadId, senderId, commandAuthorized, isGroup } = auth;
+          const messageThreadId = (msg as { message_thread_id?: number }).message_thread_id;
+          const threadIdForSend = isGroup ? resolvedThreadId : messageThreadId;
 
           const result = await executePluginCommand({
             command: match.command,
@@ -568,7 +572,7 @@ export const registerTelegramNativeCommands = ({
             bot,
             replyToMode,
             textLimit,
-            messageThreadId: resolvedThreadId,
+            messageThreadId: threadIdForSend,
             tableMode,
             chunkMode,
             linkPreview: telegramCfg.linkPreview,
diff --git a/src/telegram/bot.create-telegram-bot.installs-grammy-throttler.test.ts b/src/telegram/bot.create-telegram-bot.installs-grammy-throttler.test.ts
index bf94e4f6f90..c3844ac88aa 100644
--- a/src/telegram/bot.create-telegram-bot.installs-grammy-throttler.test.ts
+++ b/src/telegram/bot.create-telegram-bot.installs-grammy-throttler.test.ts
@@ -238,12 +238,17 @@ describe("createTelegramBot", () => {
     expect(getTelegramSequentialKey({ message: { chat: { id: 123 } } })).toBe("telegram:123");
     expect(
       getTelegramSequentialKey({
-        message: { chat: { id: 123 }, message_thread_id: 9 },
+        message: { chat: { id: 123, type: "private" }, message_thread_id: 9 },
       }),
     ).toBe("telegram:123:topic:9");
     expect(
       getTelegramSequentialKey({
-        message: { chat: { id: 123, is_forum: true } },
+        message: { chat: { id: 123, type: "supergroup" }, message_thread_id: 9 },
+      }),
+    ).toBe("telegram:123");
+    expect(
+      getTelegramSequentialKey({
+        message: { chat: { id: 123, type: "supergroup", is_forum: true } },
       }),
     ).toBe("telegram:123:topic:1");
     expect(
diff --git a/src/telegram/bot.test.ts b/src/telegram/bot.test.ts
index 75dd32faf31..c075174fb73 100644
--- a/src/telegram/bot.test.ts
+++ b/src/telegram/bot.test.ts
@@ -340,12 +340,17 @@ describe("createTelegramBot", () => {
     expect(getTelegramSequentialKey({ message: { chat: { id: 123 } } })).toBe("telegram:123");
     expect(
       getTelegramSequentialKey({
-        message: { chat: { id: 123 }, message_thread_id: 9 },
+        message: { chat: { id: 123, type: "private" }, message_thread_id: 9 },
       }),
     ).toBe("telegram:123:topic:9");
     expect(
       getTelegramSequentialKey({
-        message: { chat: { id: 123, is_forum: true } },
+        message: { chat: { id: 123, type: "supergroup" }, message_thread_id: 9 },
+      }),
+    ).toBe("telegram:123");
+    expect(
+      getTelegramSequentialKey({
+        message: { chat: { id: 123, type: "supergroup", is_forum: true } },
       }),
     ).toBe("telegram:123:topic:1");
     expect(
diff --git a/src/telegram/bot.ts b/src/telegram/bot.ts
index c41abb34b44..ae21d10da77 100644
--- a/src/telegram/bot.ts
+++ b/src/telegram/bot.ts
@@ -94,11 +94,12 @@ export function getTelegramSequentialKey(ctx: {
     if (typeof chatId === "number") return `telegram:${chatId}:control`;
     return "telegram:control";
   }
+  const isGroup = msg?.chat?.type === "group" || msg?.chat?.type === "supergroup";
+  const messageThreadId = msg?.message_thread_id;
   const isForum = (msg?.chat as { is_forum?: boolean } | undefined)?.is_forum;
-  const threadId = resolveTelegramForumThreadId({
-    isForum,
-    messageThreadId: msg?.message_thread_id,
-  });
+  const threadId = isGroup
+    ? resolveTelegramForumThreadId({ isForum, messageThreadId })
+    : messageThreadId;
   if (typeof chatId === "number") {
     return threadId != null ? `telegram:${chatId}:topic:${threadId}` : `telegram:${chatId}`;
   }