It is possible that the change may be at Amazon's servers, not in the new Kindle firmware version. As far as I can tell sideloading a book will no longer cause the associated sidecar files to be downloaded unless the book is present in your Kindle library at Amazon.
I may be wrong about this because I have a limited set of devices to test with. I would be interested in hearing whether anyone else can duplicate this finding using a Kindle with the previous firmware version 5.13.6.
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