One of the new error messages I came across reported by the new Kindle Previewer version contains a link to
an Amazon web page with additional guidance as follows:
Quote:
Enhanced Typesetting Guidance
The option to upload a book without correcting this Enhanced Typesetting error will end on September 20, 2020. After that date, please use the alternative provided in the report to publish the title on Kindle.
For any questions, please connect with the customer support channels available.
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It appears that Amazon plans to get serious about enforcing the availability of Enhanced Typesetting in published books.