A new «Feed» tab has been added to the navigation panel.
When opening a channel, you can now add it to your news feed instead of joining it. This means the channel will appear in your news feed, but you won't actually be subscribed to it.
To join the channel, you'll need to tap «Remove from News» or «Add to Chat».
Previously mentioned:
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Telegram Beta for iOS v13.2 (35726)
@telelakel | #new_tgbeta