I've set out in as much detail as I can understand what is happening when I try to POST a Bookmark with a Description to WithKnown.

And to add insult to injury, I'm adding this Description by hand, so I can include a blockquote:

[I]f you try to POST anything other than the URL of the bookmark, it simply never appears. With the help of good IndieWeb people, especially zegnat and cweiske, we worked out what was happening.

#indieweb #withknown