ps that 10% failure rate for bookari seems high. my issue with Bookari was that app updates kept introducing bugs, but I don't recall books NOT working. It was essential to keep old copies via app backup/restore utilities, in case google store pushed out a disasterous overnight update
the app would often crash on the initial licences check/ T&C screen if you rolled back a version, unless you deleted all previous traces of the buggy newer version.
& the page count by chapter adding up to t total pages per book would go haywire if there was not a 1:1 match between chapters and html files. having mutilple chapters in a single file or having a chapter split over muitiple html did upset it, so I would manually fix that with calibre or sigil before reading
Bookari used to have a reasonable support function where you could send them the problem book and ask why?
i would check the affected books in Sigil , using its tools to see if it thinks the epubs are error free, if it says yes, then send copies to bookari as bug reports
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