I had problems with MY MOBI books losing covers, as my Paperwhite 2 thought the book was a personal document. I read somewhere in the forum that I was supposed to convert from MOBI to MOBI (which seemed silly, and it failed to work) and somewhere else I read it was simplest to convert to AZW3. The AWZ3 conversion solved every issue. I now change all MOBI books to AZW3 copies before sideloading. Works for me.
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