diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 473789f01a..ec96e2bf5e 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -12,6 +12,7 @@
 - Made Telegram reference-client capability diagnostics safe for TUI embedding.
 - A Telegram notification daemon whose reconciliation pass fails no longer exits. The pass persists through the shared topic authority, and a momentarily unavailable authority (lock contention or a rejected compare-and-set) rejected out of both the scan timer and the run loop into the process-level fatal handler, killing the owner. Every session topic was then left behind as an unarchived shell that answers nothing — including for sessions that were still live and lost their notifications. The pass now reports the failure and the next scan interval retries it; the queue-flush timer is guarded the same way.
 - MiniMax M3 preset and profile ids canonicalized to `MiniMax-M3` (issue #3896): the `minimax` / `minimax-cn` onboarding presets and the `minimax-eco` / `minimax-medium` / `minimax-pro` builtin model profiles no longer reference the removed lowercase `minimax-m3` / `minimax-v3` first-class catalog ids.
+- Telegram notifications no longer disappear in a paired private chat whose bot has no Threaded Mode. Telegram answers `createForumTopic` there with `Bad Request: the chat is not a forum`, which was not recognized as a capability refusal, and the refusal verdict lived in caller-local flags — so every frame that joined the shared in-flight topic creation rethrew and its message (identity headers after `/resume`, asks, context updates) was dropped instead of being delivered flat. The rejection is now carried by typed errors that every awaiter of the same creation classifies identically, `the chat is not a forum` counts as a capability refusal, and a confirmed refusal is latched so later frames stop re-issuing a rejected `createForumTopic` per message.
 - Slash commands now expand in non-interactive runs. `gjc -p "/init"` previously reached the model as the literal text `/init`, so no command body was injected, no file was written, and the model still answered as if the command had run. Print mode now loads the same bundled and file-based command list interactive mode uses before it prompts.
 - `gjc plugin install <name>` now names the marketplaces that offer `<name>` when the npm resolution it falls back to fails, so a plugin name copied out of `gjc plugin discover` no longer dead-ends on a bare `install_failed`.
 - A remote multi-select ask now shows what is already selected. The ask tool re-issues one remote request per toggle, but the request carried no selection state, so Telegram kept posting an identical prompt with no sign that option 1 had been picked — the checkbox rendering existed only for durable workflow gates. `AskAnswerRequest` now carries `multi` and the selected option labels, the notification bus publishes them as `selectedOptionIndices` with the `(N selected)` question prefix while keeping the ask tool's own Next/Done control, and pre-numbered options (deep interview) are renumbered once instead of rendering as `1. ☑ 1. …`.
diff --git a/packages/coding-agent/src/sdk/bus/telegram-daemon.ts b/packages/coding-agent/src/sdk/bus/telegram-daemon.ts
index c7505c14ec..c698783e50 100644
--- a/packages/coding-agent/src/sdk/bus/telegram-daemon.ts
+++ b/packages/coding-agent/src/sdk/bus/telegram-daemon.ts
@@ -385,6 +385,10 @@ const BTW_QUESTION_LIMIT_TEXT = "Question must be at most 4096 Unicode scalar va
 type ParsedBtwCommand = { kind: "question"; question: string } | { kind: "ignored" };
 type TelegramFileDownload = { bytes: Buffer } | { failure: "download_failed" | "too_large" };
 class ThreadedModeCapabilityRefusal extends Error {}
+/** Telegram answered `createForumTopic` with an explicit `ok: false` rejection. */
+class TopicCreationRejected extends Error {}
+/** The transport suppressed `createForumTopic` (no response body to classify). */
+class TopicCreationSuppressed extends Error {}
 
 async function prepareTelegramImageAttachment(frame: Record<string, unknown>): Promise<Record<string, unknown>> {
 	if (frame.type !== "image_attachment") return frame;
@@ -424,7 +428,7 @@ function isThreadedModeCapabilityRefusal(response: unknown): boolean {
 	return (
 		ok === false &&
 		typeof description === "string" &&
-		/(?:threaded mode|forum topics? (?:is|are) (?:disabled|not enabled)|(?:not allowed|not permitted|cannot|can't) create forum topics?)/i.test(
+		/(?:threaded mode|forum topics? (?:is|are) (?:disabled|not enabled)|(?:not allowed|not permitted|cannot|can't) create forum topics?|chat is not a forum)/i.test(
 			description,
 		)
 	);
@@ -5070,6 +5074,8 @@ export class TelegramNotificationDaemon {
 	private readonly flatIdentitySent = new Set<string>();
 	/** Cached delivery boundary for the private owner chat or validation forum. */
 	private pairedChatPrivacy: PairedChatPrivacy | undefined;
+	/** Latched once Telegram confirms this chat cannot host forum topics. */
+	private topicCapabilityRefused = false;
 	/** Bot username from getMe, cached once at owner startup for group/forum command targeting. */
 	private botUsername: string | undefined;
 	/** Sessions whose agent loop is currently busy (drives the typing indicator). */
@@ -7838,8 +7844,6 @@ export class TelegramNotificationDaemon {
 		let acceptedTopicId: string | undefined;
 		let acceptedTopicCompensated = false;
 		let acceptedTopicArchiveAttempted = false;
-		let creationSuppressed = false;
-		let creationRejected = false;
 		let adoptedTopicId: number | undefined;
 		const adoptionIntentCandidate = this.#adoptionIntents.bySession(sessionId);
 		try {
@@ -7878,10 +7882,10 @@ export class TelegramNotificationDaemon {
 					const res = (await this.botApi.call("createForumTopic", { chat_id: this.opts.chatId, name })) as
 						| { result?: { message_thread_id?: unknown } }
 						| undefined;
-					if (res === undefined) {
-						creationSuppressed = true;
-						return undefined;
-					}
+					// Classification must travel with the rejection, not through
+					// closure flags: `getOrCreateTopic` shares one in-flight create
+					// promise, so every other awaiter observes only the error.
+					if (res === undefined) throw new TopicCreationSuppressed();
 					if (isThreadedModeCapabilityRefusal(res)) throw new ThreadedModeCapabilityRefusal();
 					const response = res as {
 						ok?: unknown;
@@ -7889,8 +7893,8 @@ export class TelegramNotificationDaemon {
 					};
 					const tid = response.result?.message_thread_id;
 					if (typeof tid !== "number" || !Number.isSafeInteger(tid) || tid <= 0) {
-						creationRejected = response.ok === false;
-						if (!creationRejected) this.#malformedTopicCreateEndpoints.set(sessionId, creationEndpointKey);
+						if (response.ok === false) throw new TopicCreationRejected();
+						this.#malformedTopicCreateEndpoints.set(sessionId, creationEndpointKey);
 						throw new Error("createForumTopic: invalid message_thread_id");
 					}
 					acceptedTopicId = String(tid);
@@ -8011,7 +8015,12 @@ export class TelegramNotificationDaemon {
 		} catch (err) {
 			if (adoptedTopicId !== undefined) this.#adoptionIntents.releaseClaim(adoptedTopicId, sessionId);
 			if (adoptionIntentCandidate) this.topics.abandonCreateClaim(sessionId, creationLeaseEpoch);
-			if (creationSuppressed || creationRejected || err instanceof ThreadedModeCapabilityRefusal) {
+			if (
+				err instanceof TopicCreationSuppressed ||
+				err instanceof TopicCreationRejected ||
+				err instanceof ThreadedModeCapabilityRefusal
+			) {
+				if (err instanceof ThreadedModeCapabilityRefusal) this.topicCapabilityRefused = true;
 				if (this.topics.abandonCreateClaim(sessionId, creationLeaseEpoch)) await this.persistTopics();
 				return undefined;
 			}
@@ -9517,6 +9526,7 @@ export class TelegramNotificationDaemon {
 	}
 
 	private async pairedChatAllowsTopics(): Promise<boolean> {
+		if (this.topicCapabilityRefused) return false;
 		const privacy = await this.resolvePairedChatPrivacy();
 		return privacy === "private" || privacy === "validation-forum";
 	}
diff --git a/packages/coding-agent/test/notifications-telegram-daemon.test.ts b/packages/coding-agent/test/notifications-telegram-daemon.test.ts
index 1b4870b9a9..7eab126222 100644
--- a/packages/coding-agent/test/notifications-telegram-daemon.test.ts
+++ b/packages/coding-agent/test/notifications-telegram-daemon.test.ts
@@ -11205,6 +11205,62 @@ test("threaded mode off: frames fall back to the flat paired chat with a one-tim
 	expect(ask).toBeTruthy();
 	expect(ask!.body.reply_markup?.inline_keyboard?.length).toBeGreaterThan(0);
 });
+test("private chat without Threaded Mode: concurrent frames all deliver flat", async () => {
+	const agentDir = tempAgentDir();
+	const bot = new FakeBotApi();
+	// Verbatim Bot API rejection for a paired private chat whose bot has no
+	// Threaded Mode; the slow response makes a second frame join the shared
+	// in-flight create instead of issuing its own.
+	bot.call = (async (method: string, body: unknown) => {
+		bot.calls.push({ method, body: body as never });
+		if (method === "createForumTopic") {
+			await Bun.sleep(30);
+			return { ok: false, error_code: 400, description: "Bad Request: the chat is not a forum" };
+		}
+		if (method === "getChat") return { ok: true, result: { type: "private" } };
+		if (method === "sendMessage") return { ok: true, result: { message_id: bot.calls.length } };
+		return { ok: true, result: true };
+	}) as never;
+	const daemon = new TelegramNotificationDaemon({
+		settings: settings(agentDir),
+		ownerId: "owner",
+		botToken: "tok",
+		chatId: "42",
+		botApi: bot,
+		rich: { enabled: false },
+		sound: "none",
+	});
+	const session = { sessionId: "S", token: "tok", ws: { readyState: 1, send() {} }, pending: new Map() };
+
+	await Promise.all([
+		daemon.handleSessionMessage(session as never, {
+			type: "identity_header",
+			sessionId: "S",
+			repo: "r",
+			branch: "b",
+		}),
+		daemon.handleSessionMessage(session as never, {
+			type: "action_needed",
+			sessionId: "S",
+			id: "ask1",
+			kind: "ask",
+			question: "Proceed?",
+			options: ["Yes", "No"],
+		}),
+	]);
+	// A later frame must not re-attempt the refused capability.
+	await daemon.handleSessionMessage(session as never, {
+		type: "context_update",
+		sessionId: "S",
+		lastMessage: "hello world",
+	});
+
+	expect(bot.calls.filter(call => call.method === "createForumTopic")).toHaveLength(1);
+	const sends = bot.calls.filter(call => call.method === "sendMessage");
+	expect(sends.every(call => call.body.message_thread_id === undefined)).toBe(true);
+	expect(sends.some(call => String(call.body.text).includes("Proceed?"))).toBe(true);
+	expect(sends.some(call => String(call.body.text).includes("hello world"))).toBe(true);
+});
 test("topic creation transport failures fail closed without flat delivery", async () => {
 	const agentDir = tempAgentDir();
 	const bot = new FakeBotApi();