So I have a pretty new portfolio website that uses NextJS with the app dir and when I'm runnig it locally, my not-found.tsx works fine, but when I deploy the app on Vercel, it just completely stops existing, which causes me to be able to visit any route and if it's a 404 then the home page will be displayed.
[The not-found on github, if it could help](https://github.com/Honzoraptor31415/PortfolioV2/blob/main/src/app/not-found.tsx)