Hmmm well at least now we know why it's not syncing for our sideloaded AZW3 files, and that it's something in the headers as I suspected. Thanks for looking into and confirming that extesy!
However, since Kovid can't or won't implement the writing of the ASIN to the AZW3 (I don't know his reasons, perhaps a search would turn those up), then maybe there's an alternate tool that will do so. Perhaps maybe Mobi2Mobi (or it's related GUI) can also write AZW3 files in addition to Mobi. Something to investigate I suppose. Unfortunately, I haven't had much free time at all so I'm just putting it out there...
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