
You've given one story URL without any indication of how it changed.
All I can do with that is confirm that trying it twice finds the existing book--which I have; including with a virtual library selected that doesn't show that book.
Personally, I use FFF's log page feature and record the story URL as well as title, author, etc. Perhaps I should make that the default.
Or is there a history somewhere on SB I don't know about?