[Python] Python telebot inline buttons do not response for some reason. Button handlers not...

Python 3.13.2 pyTelegramBotAPI-4.27.0

I have a problem with Python telebot inline buttons. It worked fine for a long time, without any problems. At some point it stopped to work. I did not change the code. I tested even basic examples and have the same behavior - handler is not triggered.

import telebot
from telebot import types

API_TOKEN = '0123456789:AaBbCcDdEe'

bot = telebot.TeleBot(API_TOKEN)

kb = types.InlineKeyboardMarkup(row_width=1)
btn_types = types.InlineKeyboardButton(text='label1', callback_data='btn_types')
kb.add(btn_types)

@bot.message_handler(commands=['start'])
def send_welcome(message):
bot.send_message(message.chat.id, "text", reply_markup=kb)

@bot.callback_query_handler(func=lambda call: True)
def answer(call):
print(call.data)
if call.data == 'btn_types':
bot.send_message(call.message.chat.id, "Button clicked")

if __name__ == '__main__':
bot.polling(none_stop=True)


Button shown, but on click nothing happens. At the same time, url inline button works fine. Plain buttons work fine as well...

What might happen?

Run bot, /start in Telegram, button shown. On button click, bot should respond with some action. However, nothing happens. In the example provided it should show chat message "Button clicked"

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