The game crashes when displaying certain TTF characters. I don't know why exactly, but I've narrowed it down to a small resource pack. This did not happen in 1.20.4

How to reproduce

1. Download the attached resource pack MC-270559.zip
2. Enable the resource pack and open a world
3. Run the following command

   tellraw @a {"text": ".", "font": "gm4:offscreen"}
   

4. Notice that the game crashed

I also came across MC-268035 while testing, so that may be related