Edit: DiapDealer beat me to it! Again!
....
Under epub3, rebuilding the TOC only impacts the NAV. The NAV is a pure html file that must always be machine readable and thus must follow a specific format.
As explained earlier if you remove linear="no" in the spine on its NAV entry, it can serve double duty serving as a machine readable TOC (just like epub2's NCX) and a user friendly TOC.
Or alternatively, as you found out, you can create a separate HTML TOC as was typically used under epub to further define or refine the NCX/NAV.
Last edited by KevinH; 05-26-2022 at 09:34 AM.
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