NB Sigil destroys tocs - it creates its own and overwrites what you had before
so you have to be real careful when using both sigil & calibre, until you get into a workable routine.
calibre has a "force TOC creation" option that you need to get to know, also & sigil has an F7 TOC editor.
you probably had a "working" toc that used html code, which calibre would leave alone, but which is almost impossible to edit.
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