Custom glyphs from resource packs fail to display when the game language is set to Japanese

Custom glyphs added through resource packs do not render correctly when Minecraft's language is set to Japanese.

The exact same resource pack and Unicode character work correctly when the language is switched to English.

Steps to Reproduce

1. Create a resource pack containing font/glyph_E9.png, with a custom icon in the first 16×16 cell.

2. Enable the resource pack in a world.

3. Set the game language to English.

4. Display the Unicode character U+E900 using chat or the /titleraw command.

5. Confirm that the custom icon is displayed correctly.

6. Change the game language to Japanese.

7. Repeat the same test without changing the resource pack.

Expected Result

Custom glyphs should render consistently regardless of the selected game language.

Actual Result

• English: The custom glyph is displayed correctly.

• Japanese: The glyph is replaced with a missing-character symbol (a box containing an X).

Additional Information

The issue is reproducible by changing only the game language. The same resource pack, texture, and Unicode character are used in both tests.

This affects creators who use custom glyphs for icons, text-based interfaces, and resource-pack UI elements.

Please investigate whether the Japanese font rendering system is preventing custom glyphs from being loaded.