Quote:
Originally Posted by theducks
Kudos to you developer for suggestions 
I regulary use H3 as my chapters...
There must be a tiny/ slight difference between the ones that are detected and those that are not. It may not be a printing (visible) character (thin space, something else)
on the next book that fails
just do a search for <h4 Find, find next until the end and see if you see it missing one that should have been caught
And are you sur that a couple are not getting nested (h4, followed by h5)
Maybe a bug got fixed (was missing h5's before)?
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He's helpful when I don't think straight.
There's no difference in the headings - I ONLY know that because I didn't change anything when I reverted back to 3.18, I just refreshed the ToC. They weren't nested, but that's a good guess.

Usually, though, when they're nested they have a little green arrow which allows me to click and see sub headings This didn't have that, just the previous entry and nothing below it. It was weird. I even tested it out on files that HAD no problem, refreshing the ToC and several chapters disappeared. I didn't save them, it just to see if it was based on which files I was using and it didn't appear to be.
I've always used "generate from all headings" because it's the only one that picks up h4 tags, "Generate ToC from files" picks up things like cover and often files I don't want. It was just easier to use "generate from all headings" when it gave me what I wanted.
I'm going to stick with 3.18, it does what I need it to do and as it took me 4 hours to reinstall my calibre library through "import", I'm not playing update roulette. (Four hours made me realise I have waaaay too many ebooks in my library).