Goodreads Librarians Group discussion

Independent Study is a single Harry Potter AU longfic by author Somewhere's Sword, AKA SomewheresSword. The two listings have the same publication data (AO3, 12/24/2020), but aren't even shown as different editions of the same work! The "576 pages" on one of them equals 250wpp × the stated wordcount of 144,148, but I'm not sure why the other says "424 pages" — perhaps from the author's now-purged fanfiction.net account?

www.goodreads.com/book/show/58489901-...
www.goodreads.com/book/show/57028731-...

archiveofourown.org/works/27475108