Not sure if it is just me but the link preview for @joeld Twitch Racket Livestream failed on both our browsers.
I worked out that if I put a link between < and > it just shows the link:
Yeah, I think that’s basically twitch instructing firefox not to allow itself to be embedded. I think your best case there is that discourse reaches in and detects that the site doesn’t want to be embedded, and provides a nicer display of that fact.
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I just noticed the message if you put a link on a single line, it tries to embed, and gives this message if it fails.
oEmbed / OpenGraph tags could not be found: description, image