Is there a max URL character length for one boxes?

I have a page here:

The bottom URL won’t convert to one box no matter what I do. Curious if it’s the URL length?

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The last link in that post is missing the og:description meta tag which is required for Discourse to onebox a link. The other links work because they have that tag present.

You can use to debug meta tags.


Thanks, and btw, that iframely site is really nice, thanks for sharing.

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