That thread, post #13

Dr Byte said

they've always required "at least one active 'button'" for as long as I can remember. That's definitely NOT "new" in the last 3 years.
I had to get a bit creative with chapter numbers so that I could 'greenlight' the TOC for pages not wanted to appear in listings but be usable from links. I recently upgraded from v1.3.9h to v1.5.3 which was outside the 3 year window mentioned.