I read books in Bulgarian, English and sometimes Russian on Kindle Oasis and an old Kindle 5. English books I try to convert to KFX using the KFX plugin and Kindle Previewer. If not possible, to AZW3. KFX English books are hyphenated, AZW3 - not. Bulgarian and Russian are not supported by Previewer, so I convert books in those languages to AZW3. Bulgarian books are not hyphenated. But some months ago after one of the firmware updates, Oasis started to hyphenate AZW3 books in Russian. I was surprised and checked - the same files are not hyphenated on the old Kindle5 and on Kindle apps for Android and Windows. I even looked inside the files and found no soft hyphens.
So my guess is that for some of the more popular languages that are not supported by KFX format, Amazon enabled hyphenation for AZW3 format in Kindle firmware. But not for languages that KFX format supports like English or for less popular languages like Bulgarian.
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