What version/build od Kindle app do you have?
I've just tried downloading couple of books I have from Kindle store on both app version 7.4.0.32 and 7.4.0.36 and for both I have for each book a folder with name that equals book'a ASIN containing bunch of .kfx files and x-ray, endActions etc.
Located at /sdcard/Android/data/com.amazon.kindle/files/
Maybe it's some kind of new opt-in extra security on per-book basis for publishers and/or selfpub authors?
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