The way my Kindle Voyage works is that the default font for a book when first opened is the last font I used with the exception of the "Publisher" Font. If I was using Bookerly, then a new book will default to Bookerly, if I was using Ember, a new book will default to Ember. It will also default to the boldness I had previously been using.
If I'm using the "publisher font"--to make the book use the font that I've embedded in the AZW file, the next book I open will default to whichever Amazon supplied font has been used last.
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