When I launch the game in default pack, nothing happens.
However when I switch to another pack, then quit and relaunch, all packs are broken on the font level. There is a file being read when it launches that isn't being read when it switches packs.
Related issues
Comments

That's what I thought but then why does it persist after you switch to vanilla
Works as intended. The file being read is your 'broken resolution' font texture.