diff --git a/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.test.ts b/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.test.ts
index 02827ee4d14..af531c34560 100644
--- a/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.test.ts
+++ b/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.test.ts
@@ -333,6 +333,7 @@ describe("telegram live qa runtime", () => {
       "telegram-context-command",
       "telegram-current-session-status-tool",
       "telegram-mentioned-message-reply",
+      "telegram-stream-final-single-message",
       "telegram-long-final-reuses-preview",
       "telegram-long-final-three-chunks",
       "telegram-mention-gating",
@@ -345,6 +346,7 @@ describe("telegram live qa runtime", () => {
       "telegram-context-command",
       "telegram-current-session-status-tool",
       "telegram-mentioned-message-reply",
+      "telegram-stream-final-single-message",
       "telegram-long-final-reuses-preview",
       "telegram-long-final-three-chunks",
       "telegram-mention-gating",
@@ -359,6 +361,15 @@ describe("telegram live qa runtime", () => {
         .find((scenario) => scenario.id === "telegram-mentioned-message-reply")
         ?.buildRun("sut_bot").replyToLatestSutMessage,
     ).toBe(true);
+    expect(
+      scenarios
+        .find((scenario) => scenario.id === "telegram-stream-final-single-message")
+        ?.buildRun("sut_bot"),
+    ).toMatchObject({
+      expectedJoinedSutTextIncludes: ["QA-TELEGRAM-STREAM-SINGLE-OK"],
+      expectedSutMessageCount: 1,
+      replyToLatestSutMessage: true,
+    });
     expect(
       scenarios
         .find((scenario) => scenario.id === "telegram-long-final-reuses-preview")
diff --git a/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.ts b/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.ts
index 50681b54a5b..5706088ddab 100644
--- a/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.ts
+++ b/extensions/qa-lab/src/live-transports/telegram/telegram-live.runtime.ts
@@ -48,6 +48,7 @@ type TelegramQaScenarioId =
   | "telegram-whoami-command"
   | "telegram-context-command"
   | "telegram-current-session-status-tool"
+  | "telegram-stream-final-single-message"
   | "telegram-long-final-three-chunks"
   | "telegram-long-final-reuses-preview"
   | "telegram-mentioned-message-reply"
@@ -300,6 +301,22 @@ const TELEGRAM_QA_SCENARIOS: TelegramQaScenarioDefinition[] = [
       replyToLatestSutMessage: true,
     }),
   },
+  {
+    id: "telegram-stream-final-single-message",
+    title: "Telegram streamed final stays one message",
+    defaultEnabled: false,
+    timeoutMs: 45_000,
+    buildRun: (sutUsername) => ({
+      allowAnySutReply: true,
+      expectReply: true,
+      input: `@${sutUsername} Quiet streaming QA check. Reply exactly: QA-TELEGRAM-STREAM-SINGLE-OK`,
+      expectedTextIncludes: ["QA-TELEGRAM-STREAM-SINGLE-OK"],
+      expectedJoinedSutTextIncludes: ["QA-TELEGRAM-STREAM-SINGLE-OK"],
+      expectedSutMessageCount: 1,
+      replyToLatestSutMessage: true,
+      settleMs: 4_000,
+    }),
+  },
   {
     id: "telegram-long-final-reuses-preview",
     title: "Telegram long final reuses the preview message",