One solution
I've discovered at least one cause of the non-working chapters and errant bookmarks. When I added one novel to my NC, I'd converted it, via Calibre, to ePub from Mobi (de-drm'd Kindle). Examining the ePub file, I realized that Calibre had broken up the text into literally dozens of smaller HTML files.
I went back into Calibre (which I'd updated) and created a new conversion. I'm still ferreting out which of the settings I changed made a difference, but this time, the resultant ePub text was split among only 3 files. I put that ePub into Sigil and pasted the text from files 2 and 3 into file 1 and deleted 2 and 3, thereby putting all of my text into 1 file.
I saved that and moved it to the NC. Now I can create bookmarks that stick and that work, and I can navigate by chapter selection.
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