Simulac
I can see you haven’t read the other replies in this thread 🙂
The new version is called Books 2.0.
The issue was that the Shortcut couldn’t find a cover, and that’s since been fixed so it now still creates the note — just without a cover image.
If the cover doesn’t exist, you’ll be asked whether you want to continue without it. If you choose to proceed, the note will still be created with all the other details, just without the cover.
You’re of course very welcome to see if you can find any other APIs that work, but as far as I know, Google’s API is still the largest and most comprehensive.