There's only one way to define headers, and that's with "h" tags. Generating a toc automatically is always risky if there's a prexisting one. Sigil will replace the existing one (working or otherwise) with one it knows how to build--and that's one built from the existing h tag hierarchy. So if you auto-generate with no h tags (or some missing h tags), the generated toc will be empty (or incomplete).
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