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@EbokJunkie: Not sure what you mean by the infamous blank calibre_raster_cover.jpg? azw3 files dont actually have internal filenames. So what are you referring to? If you open an azw3 in the editor, you will get generated filenames that look like 00001.jpg
And, as I recall, if you convert a document with no cover to azw3, the resulting azw3 will have no cover. You can try converting a simple .txt file to azw3 to check that.
IIRC only epub and pdf output formats auto-generate covers from the metadata, if no cover is present. So what you would need to do is convert no_cover.epub to auto_cover.epub and then convert auto_cover.epub to azw3
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