Resource pack with custom lang files (unsure if necessary) and TTF font
Changing the language a number of times (usually more than once) causes the game to render text and icons as black boxes and glyphs & kicks the user out of the map to the menu & also may or may not de-load all resource packs
This happens when a resource pack that has a TTF font is used, and was tested when the TTF font was used on an item along with translation codes for all languages.
The menu continues to have this display issue
Logging back into a map to press F3+T to reload resource packs (regardless of any used) will cause a crash

This issue does not exist in 1.20.4 stable release

The game crashed whilst rendering overlay
Error: java.lang.IllegalStateException: FreeType error: Unrecognized error: 0x23 (Deleting face)