yeah... I can tell you why..
On the older devices (I originally tested that for Niluje on a DX) the cover creation is actually done AT BOOK OPEN...(AND ALSO BOOK CLOSE IIRC) thus if you don't read the book for a few pages... it won't have time to make the cover...
(it uses python and imagemagick IIRC)
hope that makes it nice and clear.
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