Hi, pretty much every article on that substack is missing the headers when turning on reader mode.

0. Go to https://www.astralcodexten.com/p/practically-a-book-review-rootclaim and turn on reader mode
1. The article starts with an <h1> I. Foo, followed by some <p> and then another <h1> II. Bar. The headers are not turned into headings in reader mode.
2. The title on the page has a tagline and the data, both of them are missing, the reader mode does produce the author name though.