Digging into how withknown creates RSS feeds, I can see two things.
One is that for a status post, which has no title, `<title>` is a truncated version of the post content, although the level of truncation seems to vary. Not sure why.
The other is that even status posts, with a truncated `<title>`, have a full `<description>` that includes `p-name` and `e-content` and even `entry-content`.
But micro.blog does not seem to read `<description>` at least not when it is coming from my withknown RSS feed.