Creating `app/page/page.tsx` maps to `app/page.tsx`

[balazsorban44]

  Creating a page at route `/page` by making a file at `app/page/page.tsx` gets mapped to `app/page.tsx`, so basically `/page` route renders the same content as the `/` route. This doesn't seem to be the expected behavior.

Originally posted by @bhavesh-chaudhari in #41745 (comment)

Reproduction repository: https://github.com/balazsorban44/42010

[github-actions]

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