'Do Not Disturb' is set on an iPad Pro running ipadOS 13.3. It says "Calls and notifications will be silenced until Do Not Disturb is turned off" on the lock screen.
When someone calls me on Telegram, the notification still gets through, but in a weird way: before it's declined, instead of the Telegram call notification sound, I hear a regular call tone for half a second, and the screen lights up. Both are enough to wake me up, so 'Do not disturb' kind of fails it's purpose.
Here's what my 'Do not disturb' settings look like:
Is this an iOS bug, or is the app not honouring my 'Do not disturb' settings?