I've noticed an oddity while adding some books to shelves. Goodreads appears to have silently changed the Goodreads ID associated with some of them. For example, the book that used to be at
https://www.goodreads.com/book/show/47587632 is now at
https://www.goodreads.com/book/show/51145665. When following the link there it redirects just fine, but Goodreads Sync throws a "a book with this ID doesn't exist" error when I try to shelve it.
It's not a very big deal to me, I'll just tell Goodreads Sync to relink these books and get their new IDs. But I figured it'd be worth mentioning here. With the API retirement looming perhaps not worth fixing?