Thanks to both of you for your instruction. Sigil was, indeed, the only way to resolve this.
Fortunately we have Sigil to help correct these anomalies.
Unfortunately, I am becoming all too familiar with Sigil, as I've been seeing this type of issue more frequently on conversions from MOBI. In this book - since I had it open in Sigil anyway! - I chose to clean up several other things that weren't very cleanly made in the original file.
Cheers,
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