OK, I experimented.
Curiously editing the playOrder seemed to have no effect, at least previewing in Calibre's epub viewer.
Removing a TOC entry entirely only removes it from the TOC (duh!). Curiously Next Page at the end of the chapter goes to the missing next chapter 1st page.
So is the renderer / viewer using the list in <spine toc="ncx" of content.opf?
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