toc puzzle - missing on 1st view - OK later ?
I have had this issue a few times - have not completely diagnosed it yet, but it seems to go like this.
1.add a source to calibre & convert it ti epub with heuristics & structure detection active
2. view epub with calibre viewer -( click "view" on main toolbar ) - see no TOC ( just a single "start" in TOC )
3. think - this is strange - so open epub in sigil to check - note that each chapter does have a h2 tag!
4. try again with calibre viewer ( maybe after doing a save with sigil) - see that TOC is now complete & working.
to do more testing would require more unconverted books which I do not have to hand
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