When creating an inline note annotation on a PDF document, Korean characters (Hangul) are not rendered.
STEPS TO REPRODUCE
1. Create a text annotation
2. Add Korean text to the annotation
There is an empty yellow box on the pdf.
The yellow box should contain the supplied Korean text.
(available in About System)
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.0
If you were to include both English and Korean text in the same annotation, only the English text will be rendered. If you try to edit the annotation, you'll find that the entire text is stored, it is just not rendered properly.
I can also reproduce the issue with Japanese characters.
By the way, if I save the PDF into a new file and then open it with Evince, the Japanese text is also not rendered in Evince.
*** This bug has been marked as a duplicate of bug 305534 ***