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When a MOBI or AZW3 file names no cover (no EXTH 201 or 202), the cover is the record at the first image index if it is a JPEG, PNG or GIF, and nothing otherwise, as calibre does (metadata/mobi.py:524-532). The walk to the next image is gone: a later record may be an inline illustration, and kindlegen puts a font or RESC record first. EXTH 121 is no longer read, which also stops a stale KF8 boundary below first_image from hiding the cover.