So why the inconsistency?
When I convert to ePub v3 manually as mentioned in the previous post, I have an option to keep or discard the NCX.
When I edit the ToC of an ePub v3 file an NCX file is created without me taking any other action.
When I set Calibre to convert to ePub v3 on import, no NCX is created and I can not find anywhere to change this behaviour.
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