I did what you suggested and got the same result.
So I went to Calibre Library folder, took file cover.jpg ed converted externally to a proper dimension for Kindle Oasis, then when I converted the epub to azw3 format I used the new cover.jpg... now it's ok.
So it's Calibre not being able to do a simple cover (image) conversion (as I did in 2 seconds with Win 10 Photo Viewer)... that's a bit embarrassing!!
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