diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79164fbec0..27b8e642ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,7 @@ Status: stable.
 - Telegram: avoid silent empty replies by tracking normalization skips before fallback. (#3796)
 - Telegram: accept numeric messageId/chatId in react action and honor channelId fallback. (#4533) Thanks @Ayush10.
 - Telegram: scope native skill commands to bound agent per bot. (#4360) Thanks @robhparker.
+- Telegram: fall back to session origin thread id for delivery context when missing. (#4911) Thanks @yevhen.
 - Mentions: honor mentionPatterns even when explicit mentions are present. (#3303) Thanks @HirokiKobayashi-R.
 - Discord: restore username directory lookup in target resolution. (#3131) Thanks @bonald.
 - Agents: align MiniMax base URL test expectation with default provider config. (#3131) Thanks @bonald.
diff --git a/src/config/sessions/store.ts b/src/config/sessions/store.ts
index a4a0dbf8b5..da581fff01 100644
--- a/src/config/sessions/store.ts
+++ b/src/config/sessions/store.ts
@@ -60,7 +60,7 @@ function normalizeSessionEntryDelivery(entry: SessionEntry): SessionEntry {
     lastChannel: entry.lastChannel,
     lastTo: entry.lastTo,
     lastAccountId: entry.lastAccountId,
-    lastThreadId: entry.lastThreadId ?? entry.origin?.threadId,
+    lastThreadId: entry.lastThreadId ?? entry.deliveryContext?.threadId ?? entry.origin?.threadId,
     deliveryContext: entry.deliveryContext,
   });
   const nextDelivery = normalized.deliveryContext;
diff --git a/src/utils/delivery-context.test.ts b/src/utils/delivery-context.test.ts
index e89d965057..e0c7e71c4c 100644
--- a/src/utils/delivery-context.test.ts
+++ b/src/utils/delivery-context.test.ts
@@ -88,6 +88,20 @@ describe("delivery context helpers", () => {
       accountId: undefined,
       threadId: 42,
     });
+
+    expect(
+      deliveryContextFromSession({
+        channel: "telegram",
+        lastTo: " -1001 ",
+        deliveryContext: { threadId: " 777 " },
+        origin: { threadId: 42 },
+      }),
+    ).toEqual({
+      channel: "telegram",
+      to: "-1001",
+      accountId: undefined,
+      threadId: "777",
+    });
   });
 
   it("normalizes delivery fields and mirrors them on session entries", () => {
diff --git a/src/utils/delivery-context.ts b/src/utils/delivery-context.ts
index 5e9db288be..61a8c08c15 100644
--- a/src/utils/delivery-context.ts
+++ b/src/utils/delivery-context.ts
@@ -98,7 +98,7 @@ export function deliveryContextFromSession(
     lastChannel: entry.lastChannel,
     lastTo: entry.lastTo,
     lastAccountId: entry.lastAccountId,
-    lastThreadId: entry.lastThreadId ?? entry.origin?.threadId,
+    lastThreadId: entry.lastThreadId ?? entry.deliveryContext?.threadId ?? entry.origin?.threadId,
     deliveryContext: entry.deliveryContext,
   };
   return normalizeSessionDeliveryFields(source).deliveryContext;