Why telegram bot may not respond to text messages?

Question

Python

There is a telegram bot running on a server under ubuntu. The bot receives updates via weebhook. I use self-signed certificates.
The bot works great through Long Polling. When working through a webhook, the bot only responds to commands. It does not process normal messages. The text message handler looks like this:

@bot.message_handler(func=lambda message: True, content_types=['text'])

Another bot was running on the same server with a webhook with the same certificates. Now this bot is disabled, but at startup it still works.
What could be the problem?

Answer 1

Issue resolved. Replaced cherrypy with flask.
(I forgot to mention that I used cherrypy for work)