I will try these things, but I am quite mystified why it would be a problem for this specific book and not for any others from the same sources. It is indeed an epub, a commercial distribution.
I used Calibre to locate and download another cover, a jpg. Both the original and this one show up fine within the Calibre app itself, but not in the ebook viewer. The viewer shows a text cover (name, author, publisher) but not the jpg. There is no text cover showing up in the Kobo, just a blank page.
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