From 4358f1d51c588e76d03aa677f9b7deabbbc1af9d Mon Sep 17 00:00:00 2001
From: RomanDavydchuk <roman.davydchuk@n8n.io>
Date: Wed, 29 Apr 2026 16:57:52 +0300
Subject: [PATCH] fix(Telegram Trigger Node): Drop pending updates when
 creating a new webhook (#29103)

---
 .../nodes/Telegram/TelegramTrigger.node.ts    |  7 ++-
 .../tests/TelegramTrigger.node.test.ts        | 45 ++++++++++++++++++-
 2 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/packages/nodes-base/nodes/Telegram/TelegramTrigger.node.ts b/packages/nodes-base/nodes/Telegram/TelegramTrigger.node.ts
index 2df8701e3f1..db6ba8f2122 100644
--- a/packages/nodes-base/nodes/Telegram/TelegramTrigger.node.ts
+++ b/packages/nodes-base/nodes/Telegram/TelegramTrigger.node.ts
@@ -19,8 +19,8 @@ export class TelegramTrigger implements INodeType {
 		name: 'telegramTrigger',
 		icon: 'file:telegram.svg',
 		group: ['trigger'],
-		version: [1, 1.1, 1.2],
-		defaultVersion: 1.2,
+		version: [1, 1.1, 1.2, 1.3],
+		defaultVersion: 1.3,
 		subtitle: '=Updates: {{$parameter["updates"].join(", ")}}',
 		description: 'Starts the workflow on a Telegram update',
 		defaults: {
@@ -226,10 +226,13 @@ export class TelegramTrigger implements INodeType {
 
 				const secret_token = getSecretToken.call(this);
 
+				const drop_pending_updates = this.getNode().typeVersion >= 1.3;
+
 				const body = {
 					url: webhookUrl,
 					allowed_updates: allowedUpdates,
 					secret_token,
+					drop_pending_updates,
 				};
 
 				await apiRequest.call(this, 'POST', endpoint, body);
diff --git a/packages/nodes-base/nodes/Telegram/tests/TelegramTrigger.node.test.ts b/packages/nodes-base/nodes/Telegram/tests/TelegramTrigger.node.test.ts
index c926544b44d..165a6fb55ed 100644
--- a/packages/nodes-base/nodes/Telegram/tests/TelegramTrigger.node.test.ts
+++ b/packages/nodes-base/nodes/Telegram/tests/TelegramTrigger.node.test.ts
@@ -1,8 +1,9 @@
 import { mock } from 'jest-mock-extended';
-import { type INode, type Workflow } from 'n8n-workflow';
+import type { IHookFunctions, INode, Workflow } from 'n8n-workflow';
 
 import { testWebhookTriggerNode } from '@test/nodes/TriggerHelpers';
 
+import { apiRequest } from '../GenericFunctions';
 import { TelegramTrigger } from '../TelegramTrigger.node';
 
 jest.mock('../GenericFunctions', () => {
@@ -173,4 +174,46 @@ describe('TelegramTrigger', () => {
 			expect(responseData).toEqual({ workflowData: [[{ json: mockResult }]] });
 		});
 	});
+
+	describe('create', () => {
+		test('should set drop_pending_updates for version 1.3', async () => {
+			const telegramTrigger = new TelegramTrigger();
+			const mockHookFunctions = mock<IHookFunctions>({
+				getNodeWebhookUrl: jest.fn().mockReturnValue('https://example.com/webhook'),
+				getNodeParameter: jest.fn().mockReturnValue(['message']),
+				getNode: jest.fn().mockReturnValue({ id: '2', typeVersion: 1.3 }),
+				getWorkflow: jest.fn().mockReturnValue({ id: '1' }),
+			});
+
+			await telegramTrigger.webhookMethods.default.create.call(mockHookFunctions);
+
+			expect(jest.mocked(apiRequest)).toHaveBeenCalledWith(
+				'POST',
+				'setWebhook',
+				expect.objectContaining({
+					drop_pending_updates: true,
+				}),
+			);
+		});
+
+		test('should not set drop_pending_updates for version 1.2', async () => {
+			const telegramTrigger = new TelegramTrigger();
+			const mockHookFunctions = mock<IHookFunctions>({
+				getNodeWebhookUrl: jest.fn().mockReturnValue('https://example.com/webhook'),
+				getNodeParameter: jest.fn().mockReturnValue(['*']),
+				getNode: jest.fn().mockReturnValue({ id: '2', typeVersion: 1.2 }),
+				getWorkflow: jest.fn().mockReturnValue({ id: '1' }),
+			});
+
+			await telegramTrigger.webhookMethods.default.create.call(mockHookFunctions);
+
+			expect(jest.mocked(apiRequest)).toHaveBeenCalledWith(
+				'POST',
+				'setWebhook',
+				expect.objectContaining({
+					drop_pending_updates: false,
+				}),
+			);
+		});
+	});
 });