Telegram bot can't answer with delay when hosted on Vercel

[StepanMogilyov]

Problem Description

When a telegram bot is hosted on Vercel, it cannot respond with a delay to a request. But it works when I run the bot on my computer. I'm assuming Vercel either can't process or is blocking requests nested in setTimeout. Could you give me a hint to help solve this problem?

import TeleBot from "telebot";
import dotenv from "dotenv";
dotenv.config();

const bot = new TeleBot({ token: process.env.BOT_TOKEN });

bot.on("/start", async (msg) => {
  await bot.sendMessage(msg.chat.id, "Hello!");
});

bot.on("text", async (msg) => {
  if (msg.entities) {
    var wasBotMentioned = msg.text.includes("bot_name");
  }
  const chatType = msg.chat.type;
  if (chatType === "private" || (chatType === "supergroup" && wasBotMentioned) || (chatType === "group" && wasBotMentioned)) {
    await bot.sendMessage(msg.chat.id, "answer instantly"); // on Vercel: it works. | In dev mode: it works
    setTimeout(async () => {
      await bot.sendMessage(msg.chat.id, "answer delay"); //on Vercel: answer in timeout won't work. Also there are no errors. | In dev mode: it works
    }, 2000);
  }
});