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real plain mobi (KF7 and azw) NEVER has embedded fonts. That's only possible with azw3 (KF8), dual mobi (KF7 and KF8 in one overall file) and the KFX.
if you are distributing via Amazon KDP, (or using Send to Kindle) then upload checked epub2 also verified on real eink epub readers and on real Amazon Kindle eink via epub to azw3 conversion in Calibre. Older than KK3, DX and DXG only work with old mobi, KF7. A KK3 on older Firmware can't do azw3.
Amazon sends the user old mobi (maybe azw), azw3 or KFX depending on what it's being sent to.
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