I've had that issue since I bought my aura about 2 years ago which had at that time the firmware 2.8.x i beleive.
I've always updated my firmware as soon as it was available via the kobo application (currently using version 3.19.5761).
I guess the issue you are referring to in the pre 3.16.0 versions didn't help, but using the checkbox you've indicated in your previous message did definitively resolve the issue when converting from amazon azw3 format to epubs.
Thanks again.
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