For me personally, on Kindle 2.7.1, the following books are downloading as azw6(?) after relogin (they are older books, not comics, so I assumed it was because of age):
B00VZZ085G
B01A6G9AOE
B01M61KOEN
B0CV957NKN
I am too lazy to discern their titles, and some seem to be missing from amazon/ "out of print"
I was also told, and did not confirm due to them being different region (german), that the following newer titles came as AZW6:
B0F6GPFZPJ
B0DLX13RJ4
B0DYQ1S85X
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