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Editor shows blank eventually when editing this thread https://community.mybb.com/thread-224651.html , So I'll have to post another thread for investigation.

Probably, Vimeo is the first to try, as https://community.mybb.com/thread-224625.html . The incorrect one:

https://vimeo.com/23428725

video=vemio]https://vimeo.com/23428725[/video]

Following by the correct one:

Vimeo:

https://vimeo.com/23428725

video=vimeo]https://vimeo.com/23428725[/video]
So, this is why since vimeo is not recognized as a supported video provider in 1.8.21.

Let's try another arbitrary video provider.

DoesItExist:

https://DoesItExist.com/8888888

[video=DoesItExist]https://DoesItExist.com/8888888[/video]