I've been using #Telegram since 2016, but only yesterday I found out that there are official servers for testing and debugging bots, web apps and non-standard clients. With free premium, the ability to register a channel with a verification checkmark and without the risk of getting banned due ddos requests to the API and vandalism in channels and chats. Test servers exist separately from the production servers, do not overlap with each other, but work identically.
In the past, I used to put my bots straight into production and test them on live users. How I survived with this approach is unclear.
The potential of what I have discovered is, of course, huge. I should take advantage of it and update my projects with packages.