Many thanks for the detailed replies.
Keeping my Kindle in airplane mode would work but is not feasible for me. Re-uploading also doesn't help, the book cover briefly reappears again but disappears when the kindle connects.
So it does look like my original workaround is the best route for now.
I will go and post on the amazon forums but I'm not hopeful...
Is there any possibility that Calibre could detect that a thumbnail it had written has been changed, and change it back?
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