basePath + rewrites breaks dynamic routes when fallback: false

[nbouvrette]

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
Platform: darwin
Arch: arm64
Version: Darwin Kernel Version 21.6.0: Wed Aug 10 14:28:23 PDT 2022; root:xnu-8020.141.5~2/RELEASE_ARM64_T6000
Binaries:
Node: 16.17.0
npm: 8.19.1
Yarn: N/A
pnpm: N/A
Relevant packages:
next: 12.3.1-canary.2
eslint-config-next: 12.3.0
react: 18.2.0
react-dom: 18.2.0

What browser are you using? (if relevant)

N/A

How are you deploying your application? (if relevant)

N/A

Describe the Bug

When using basePath + rewrites, dynamic routes will return 404 if fallback: false.

Expected Behavior

The page should work.

Link to reproduction

https://github.com/nbouvrette/basepath-rewrites-dynamic-route-issue

To Reproduce

1. npm install
2. npm run dev
3. Hit: http://localhost:3000/some-path/fr-FR/ville/londres -> returns a 404
4. in pages/city/[city].tsx change fallback: false to fallback: true
5. Reload the page, and it should work
6. Change back fallback: false and edit next.config.js and comment out basePath
7. Restart the application
8. Hit: http://localhost:3000/fr-FR/ville/londres -> works!

[vercel-release-bot]

This issue has been automatically marked as stale due to two years of inactivity. It will be closed in 7 days unless there’s further input. If you believe this issue is still relevant, please leave a comment or provide updated details. Thank you.

[nextjs-bot]

This issue has been automatically closed due to two years of inactivity. If you’re still experiencing a similar problem or have additional details to share, please open a new issue following our current issue template. Your updated report helps us investigate and address concerns more efficiently. Thank you for your understanding!