Just to knock this "it's the font file, it's the font file, the Russians are coming, it's the font file" nonsense on the head once and for all:
1) I have now deleted all Bookerly files.
2) Done a hard restart
3) Copied the Bookerly back
4) Done a hard restart
Bookerly is now working correctly across all books I tried.
As I suspected, the problem was not related to the actual font files themselves. Some internal state in the Kobo was screwed.
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