My forum (updated within past 7 days) also has no subdomain. This url pasted into a title works for me.
https://www.youtube.com/watch?v=NQUnHEgKlUE
This other example does not work well.
https://youtu.be/Jh0jPUBP9Iw?si=s9wQGHPF1rryNyED
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