The web reader's saveProgress always sent epubcfi: cfi || "", even
for fixed-layout comics/PDFs. Foliate's comic renderer generates a
fake CFI (epubcfi(/6/{n})) for every page via CFI.fake.fromIndex,
which the server stored as a valid locator. These fake CFIs are
meaningless — the page index is the canonical locator for image-based
content — and they caused koreader to crash on pull (see prior commit).
Only set epubcfi in the request body for reflowable documents.
john-okeefe
9bd23fc1d7