The problem is that HTML::Toc generates invalid HTML.

<a name=h-1><h1>Header One</h1></a>
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HTML::GenToc puts the H1 and A tags in the correct order, but doesn't understand (at least, it's not in the docs) the preferred way to do it, which is the way my existing HTML is:

<H1 id="h-1">Header One</H1>
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I'd want inserted tags to use this way, and it must certainly understand this way!

—John