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I spent the past couple of hours trying to fix the problem I was seeing with sideloaded TTF fonts not applying custom bolding in books that included an embedded "Publisher Font." I think (I hope) I have solved the problem.
This problem existed on all three of my current Kindles: two Oasis 3s and one Paperwhite 4, all upgraded to 5.13.2. The issue persisted through many reboots, resetting of themes, reselecting of fonts. All of my Kindles are set up the same including sideloaded fonts, themes, etc.
What seems to have fixed it on all three devices:
* I deleted all of the files in the Kindle's "fonts" folder.
* I then re-copied all of my fonts back to the "fonts" folder.
* I rebooted the Kindle for good measure.
* I finally reset my themes (they all defaulted to using the Bookerly font after the font purge/reload).
Custom font bolding is now working again with all of my purchased books that allow it, regardless of whether or not a "Publisher Font" is embedded.
My best guess is that font parsing/cache/whatever needed to be reset after the firmware upgrade and removing and readding them parsed them anew and all seems well now.
Please don't try this at home unless you're seeing problems like mine and do backup all of your fonts before even dreaming about deleting anything.
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