All of my pages are within app/[locale], and because of this I had to rename app/not-found.tsx to app/[locale]/[...catchAll]/page.tsx which means that NextJS doesn't detect it as a global not found anymore.

This is fine, except that it makes the route dynamic instead of static even though I have the locales defined in generateStaticParams.

Route (app)                                    Size     First Load JS
┌ ○ /_not-found                                875 B          82.7 kB
├ ● /[locale]                                  5.95 kB         107 kB
├   ├ /en
├   └ /hi
├ λ /[locale]/[...catchAll]                    175 B          88.8 kB
...

â—‹  (Static)   prerendered as static content
●  (SSG)      prerendered as static HTML (uses getStaticProps)
λ  (Dynamic)  server-rendered on demand using Node.js