Not seeing not-found page on production deployment with dynamicParams = false about next.js HOT 3 OPEN

This is what happens on Vercel:
https://nextjs-notfound.vercel.app/nothing/page-d
And this is on Netlify:
https://next-notfound-test.netlify.app/nothing/page-d
from the same commit.

from next.js.

Same problem with my app: https://github.com/maxpatiiuk/max.patii.uk
Live example: https://max.patii.uk/some-non-existent-page
Strangely, this particular URL does display the not-found page: https://max.patii.uk/_not-found
Started around the time I migrated from pages to app router

2024-06-15T20:55:41.323Z  Route (app)                                  Size     First Load JS
2024-06-15T20:55:41.324Z  ┌ ○ /                                        141 B           108 kB
2024-06-15T20:55:41.324Z  ├ ○ /_not-found                              141 B            90 kB

from next.js.

Any news here?

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from next.js.