Issue Summary

When exporting a Confluence page that contains Japanese text to PDF, the Kanji are rendered with a Chinese‑style CJK font instead of a Japanese font. This makes the document look incorrect/unnatural to Japanese readers (stroke shapes and glyph forms match Simplified/Traditional Chinese instead of Japanese JIS forms).

This is different from characters not rendering at all or appearing as tofu (□). All characters are present, but the glyph variant is wrong – the renderer chooses Chinese forms over Japanese forms.

This appears to be a font / language‑tag / fallback issue similar in nature to CONFCLOUD-71802: Custom Font Files might cause rendering issues on PDF Export and CONFCLOUD-58564: Export to PDF doesn't export special characters, but specifically affects Japanese vs. Chinese glyph selection.

Steps to Reproduce

1. In Confluence Cloud, create a page with Japanese text including Kanji that have distinct Japanese vs. Chinese forms, for example:

   編 単 歩 対 差 晩 宮 浄 決 変 帯 臭 圧 別 花 角

2. Export the page to PDF using ••• → Export to PDF.
3. Open the generated PDF in Adobe Acrobat Reader / Preview / browser PDF viewer.
4. Compare the Kanji shapes with a known Japanese font (e.g., IPAex Mincho, IPAex Gothic) and with a Chinese font.

Expected Results

1. Japanese text in the PDF is rendered using Japanese glyph variants for Kanji (JIS‑compatible forms).
2. The font used in PDF is consistent with the configured PDF export font and language (e.g., ja), not a Chinese‑optimized CJK font.

Actual Results

1. Japanese Kanji are rendered using Chinese glyph variants.
   
   This occurs even when PDF Export Language is configured with Japanese font, such as NotoSansJP.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available