Amazon book version error

When I try to save books to Zotero from Amazon, I was simply getting the standard pop-up that says "Saving to [Collection]" but with the title of the book greyed-out, and then nothing else happens. The book never appears in my Zotero library, and the pop-up remains on the browser page.

It appears this happens if the search result brings up the "hardcover" or "paperback" version of the book, but can be corrected by choosing the Kindle version. For example, when I search for this book, the first result returned is the hardcover: https://www.amazon.com/George-Washingtons-Hair-Americans-Remembered/dp/0813946506/ - and I get the error; but if I select the Kindle version instead, it saves normally.

Only a small hassle if one realizes the solution, but a major obstacle until I figured it out.

I checked the Error Log in the connector, but it does not seem to have generated an error report

Version details:
Mac OS 11.5.2
Firefox 95.0.2 (64-bit)
Zotero 5.0.97
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