Trying to onebox new blog posts from https://stackoverflow.blog fails, the message stay as a plain link to the blog post and does not onebox anymore. Example.

Oneboxing of older posts is still fine. Example.

Something changed, probably around June 2019, causing the onebox to fail.

One thing that popped in quick look into the source code is missing <link> tag:

<link rel="alternate" type="application/rss+xml"  ...

Which exists in old blog posts but not in the new ones.

Can this please be fixed?

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