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View source for Ответ: Embedding Youtube code: possible?

Replace the URL not works. I did it in Sandbox, those two links you deleted. 
Links are different - the working example has ##youtube-nocookie.com/embed##
In my non-working - 
##youtube.com/watch?v=##
##youtube.com/shorts/##
I suspect ##youtu.be/## won't work either
Any idea for make Copy-Paste links works?