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Any of well-formed check, epubcheck or epubveri options works to warn me of the errors.
I triggered the issue when the original ePub did not believe in line breaks so each file was a solid mass of text and I pretty-printed it using mend and prettify from the Tools menu. I dumped that version, reopened the original and pretty-printed it. After that, I ended up using search/replace & regex to do most of the cleanup to get the book ready to be published. The author couldn't remember which web page she used to do the AI assisted conversion from her word processor file to ePub but will not use it again.
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