In NextJS12, rewriting locale paths does not work

[osehmathias]

Verify canary release

• [X] I verified that the issue exists in Next.js canary release

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 21.4.0: Mon Feb 21 20:36:53 PST 2022; root:xnu-8020.101.4~2/RELEASE_ARM64_T8101
Binaries:
  Node: 17.7.2
  npm: 8.5.2
  Yarn: N/A
  pnpm: N/A
Relevant packages:
  next: 12.1.5
  react: 18.0.0
  react-dom: 18.0.0

What browser are you using? (if relevant)

Chrome

How are you deploying your application? (if relevant)

No response

Describe the Bug

In NextJS 11, I could use a rewrite to alias a locale path.

For example, instead of having /en-AU as the path, I could add a rewrite so that /au points to /en-AU. This is a much cleaner experience. This is not available in NextJS12

Expected Behavior

I can create a rewrite so that /au can be used as an alias for /en-AU

To Reproduce

Upgrade to NextJS12. Add locales. Create a rewrite so that the 2 letter country code points to the 5 letter language-Region code

[aralroca]

Same problem here