Comment by mikek

WhatsApp is not linkifying Telegram URLs, but Telegram is not even sending messages that are shared from WhatsApp. Telegram is open source, so you can see for yourself here.

https://github.com/DrKLO/Telegram/blob/74def22213846b1f90a26...

On line 666:

    if (sendingText.contains("WhatsApp")) { //who needs this sent from ...?
        sendingText = null;
    }