Is MODE still shown to IRC clients?

Documentation fixes can be suggested on the uservoice, not by pinging staff

https://twitch.uservoice.com/forums/310213-developers?category_id=358000

(which is also linked at the bottom of the documentation pages)

Twitch doesn’t (fully) implement the RFC, TMI is a custom chat implementation that is available via an IRC port (and over websockets) that looks like IRC but it isn’t.

The general consensus is that they stop working in 1k+, and are generally not reliable, as tags/badges should be used instead. If you are not getting them, sounds like that sub system has dropped offline again (it’s no reliable, as again, tags/badges are the correct method to check for op status or other roles). I don’t bother even parsing for them (modes), as Tags/Badges are the correct way to check for moderator status (or other roles) in a channel