I've created a PDF with the 𝒟 glyph and ran the latest version of bookletimposer (0.3beta1-1) against it and didn't have any errors.
Nicolas, could you please check if that works for you to be sure? I'd like to close this bug report :) -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Louis-Philippe Véronneau ⢿⡄⠘⠷⠚⠋ po...@debian.org / veronneau.org ⠈⠳⣄
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