Encrypted calls randomly crash Telegram on iOS (v8.1.2 on iOS 15.0.2). This will lead to an abrupt end of the call and the other participant won't even notice immediately. Sometimes when this happens, also no 'Outgoing Call' or 'Incoming Call' message is added to the chat history.
Steps to reproduce
There's no reliable way of reproducing this bug, sometimes the crash happens after a few seconds of calling, sometimes it works for more than 10 minutes. It doesn't matter if the other participant is using an Android or iOS phone.
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