I'm attempting to add a table of contents with cuneiform characters to a pdf file with pdftk. However, they are not rendering correctly in kybook3- in the table of contents under the "Outline" tab, they display as gibberish characters, although in the footer display in the bottom left showing the current section, it does display correctly.
Attached are screenshots showing the problem, as well as the pdf file in question. The unicode character that I have in the test file is 𒀸, U+12038.
output - Unknown_864-1.pdf


KyBook 3 version: 0.7.8
iPad OS version 18.6.2