href="#abalone-chowder-anchor"
href="#dried-wild-mushrooms-anchor"
These aren't specifying a file before the fragment id. From the spurious lang attribute I'm guessing you've exported this from InDesign and run into InDesign's link bug. Try exporting it without checking the box which splits it at first-level headings, though that means you'll need to use Sigil to do the ToC.
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