The bug limiting the indentation of the TOC to two levels in Apple Books remains unfixed. Interestingly, Apple Books can correctly display TOCs deeper than two levels. If you create a test document in Pages with a three-level table of contents and export it to EPUB, you'll initially only see two levels due to wrong indentation of the 3rd level. But if you edit the TOC in Sigil or Calibre to indent the third level, Apple Books will display it correctly.
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