I've recently migrated all the routes on my project from pages router to app router. I no longer have a pages folder. The build output is still showing the pages router, 404 route.
Route (pages) Size First Load JS
─ o /404 202 B 86.6 kB
+ First Load JS shared by all 86.4 kB
- chunks/framework-a92791af35b6cd55.js 45.1 kB
- chunks/main-73ee2d915f58a0d1.js 28 kB
- chunks/pages/_app-514ed2a69a71f9b0.js 210 B
- chunks/webpack-63b34cf7686a351b.js 13.1 kB
I was expecting that part of the output to disappear completely.