I have an up-to-date Aura ONE and I'm using Calibre 4.23 together with Apprentice Alf's De-Drm tools.
At page 401 for some reason a couple of pages are missing (on Aura) although they show up fine in the Calibre Reader or editor. (In fact I think the Calibre Reader probably renders the whole book better than the Kobo).
I looked at this thread
https://mobileread.com/forums/showthread.php?t=327313 (Epubs loaded to Kobo missing small bits of text) which looked similar but it hasn't helped.
I tried running Calibre Editor to automatically fix ePub errors, no difference.
I tried ePub -> ePub conversion, no difference.
In that thread an "ornamental-break" seemed to be implicated but I can't see one anywhere near the area that I'm having issues.
Can anyone suggest any further measures or ways of tracking down the issue?
TIA.