I'm having a problem with the plugin grabbing an isbn rather than the asin for Kindle editions of books. Get ASIN for Kindle Editions is ticked in the options.
For example when the only id for the book in Calibre is goodreads:40489693 I would expect to get back the amazon id amazon:B07DH9HCPT and no ISBN because that edition doesn't have an ISBN, this is what used to happen before I upgraded to Calibre 5 and the python 3 plug-in version. But instead I get a ISBN and no asin/amazon ID.
I've also found it I give the book just the ID amazon:B07DH9HCPT it still wants to grab an ISBN that dosen't belong to that edition, but at least that way I do get the goodreads id (which I want) aswell as the ISBN (which I don't want).
Windows 10, Calibre 5.4.2, Goodreads Plugin 1.5.1
Any help would be really appreciated, and thanks for all the work you've already done