It turns out that the category which appears in the slug or permalink is the first one in the list checked. If you delete a category later, the permalink is changed. Interestingly, in this case, the page was successfully found…
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This is a “hand-crafted” excerpt, which is to say that it isn’t an excerpt at all, just something I have written! It was entered in the Excerpt box below the content box on the edit Post page. Hmmm, doesn’t seem to be that simple?