I'm going to do some more tests here today, if I can find the time.
I did notice both the "font does not exist!" and "invalid URL" issues from the log before, and tried everything I could think of to fix them. Since they went away when I got it to work, I considered them to be essentially bogus error messages.
There is definitely some kind of font-fix step in KDP before KDP's kindlegen is called. KDP will subset ttf fonts during that step (at least, in my previous book, KDP verifiably subsetted my two headings fonts, though it only included all the needed characters if they appeared early enough in the font file—I think I mentioned that earlier in this thread, or another one).
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