diff --git a/extensions/telegram/src/bot-message-dispatch.reasoning-room-events.test.ts b/extensions/telegram/src/bot-message-dispatch.reasoning-room-events.test.ts
index 0e4273a074ae..27463e28711f 100644
--- a/extensions/telegram/src/bot-message-dispatch.reasoning-room-events.test.ts
+++ b/extensions/telegram/src/bot-message-dispatch.reasoning-room-events.test.ts
@@ -188,21 +188,34 @@ describeTelegramDispatch("dispatchTelegramMessage reasoning-room-events", () =>
     expect(deliverReplies).not.toHaveBeenCalled();
   });
 
-  it("suppresses internal reflection when reasoning streams", async () => {
-    const { reasoningDraftStream } = setupDraftStreams({
+  it("suppresses whitespace-form internal prefixes until one visible final", async () => {
+    const { answerDraftStream, reasoningDraftStream } = setupDraftStreams({
       answerMessageId: 2001,
       reasoningMessageId: 3001,
     });
     mockTurn(async ({ dispatcherOptions }) => {
-      await dispatcherOptions.deliver(
-        { text: "<internal>private reflection</internal>", isReasoning: true },
-        { kind: "final" },
-      );
+      for (const text of [
+        "< internal",
+        "<  internal",
+        "</ internal",
+        "< / internal",
+        "<\u00a0internal",
+      ]) {
+        await dispatcherOptions.deliver({ text, isReasoning: true }, { kind: "block" });
+      }
+      expect(reasoningDraftStream.update).not.toHaveBeenCalled();
+      expect(deliverReplies).not.toHaveBeenCalled();
+      await dispatcherOptions.deliver({ text: "VISIBLE" }, { kind: "final" });
     });
 
     await dispatchWithContext({ context: createReasoningStreamContext() });
 
     expect(reasoningDraftStream.update).not.toHaveBeenCalled();
+    expect(answerDraftStream.update).toHaveBeenCalledTimes(1);
+    expect(answerDraftStream.update).toHaveBeenCalledWith(
+      "VISIBLE",
+      expect.objectContaining({ onPlatformSendDispatch: expect.any(Function) }),
+    );
     expect(deliverReplies).not.toHaveBeenCalled();
   });
 
diff --git a/extensions/telegram/src/reasoning-lane-coordinator.test.ts b/extensions/telegram/src/reasoning-lane-coordinator.test.ts
index f60aaaf0aec3..8523616fcf96 100644
--- a/extensions/telegram/src/reasoning-lane-coordinator.test.ts
+++ b/extensions/telegram/src/reasoning-lane-coordinator.test.ts
@@ -41,9 +41,22 @@ describe("splitTelegramReasoningText", () => {
     });
   });
 
-  it("does not emit partial reasoning tag prefixes", () => {
-    expect(splitTelegramReasoningText("  <thi", true)).toStrictEqual({});
-    expect(splitTelegramReasoningText("  <int", true)).toStrictEqual({});
+  it.each([
+    "  <thi",
+    "  <int",
+    "< internal",
+    "<  internal",
+    "</ internal",
+    "< / internal",
+    "<\u00a0internal",
+  ])("does not emit partial reasoning tag prefix %j", (text) => {
+    expect(splitTelegramReasoningText(text, true)).toStrictEqual({});
+  });
+
+  it("keeps unrelated partial tags visible", () => {
+    expect(splitTelegramReasoningText("< interface", true)).toStrictEqual({
+      reasoningText: "🧠 _< interface_",
+    });
   });
 
   it("keeps visible Thinking-prefixed answers in the answer lane", () => {
diff --git a/extensions/telegram/src/reasoning-lane-coordinator.ts b/extensions/telegram/src/reasoning-lane-coordinator.ts
index 2ecc25f8e4e0..e2e1e70aa342 100644
--- a/extensions/telegram/src/reasoning-lane-coordinator.ts
+++ b/extensions/telegram/src/reasoning-lane-coordinator.ts
@@ -1,7 +1,6 @@
 // Telegram plugin module implements reasoning lane coordinator behavior.
 import { formatReasoningMessage } from "openclaw/plugin-sdk/agent-runtime";
 import type { ReplyPayload } from "openclaw/plugin-sdk/reply-payload";
-import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
 import {
   findCodeRegions,
   isInsideCode,
@@ -71,14 +70,14 @@ function extractThinkingFromTaggedStreamOutsideCode(text: string): string {
 }
 
 function isPartialReasoningTagPrefix(text: string): boolean {
-  const trimmed = normalizeLowercaseStringOrEmpty(text.trimStart());
+  const trimmed = text.trim().replace(/^<\s*(\/?)\s+/u, "<$1");
   if (!trimmed.startsWith("<")) {
     return false;
   }
   if (trimmed.includes(">")) {
     return false;
   }
-  return REASONING_TAG_PREFIXES.some((prefix) => prefix.startsWith(trimmed));
+  return REASONING_TAG_PREFIXES.some((prefix) => prefix.startsWith(trimmed.toLowerCase()));
 }
 
 type TelegramReasoningSplit = {