Middleware receive extra locale prefix in request.url

[promer94]

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 22.2.0: Fri Nov 11 02:03:51 PST 2022; root:xnu-8792.61.2~4/RELEASE_ARM64_T6000
Binaries:
Node: 18.12.0
npm: 8.19.2
Yarn: 1.23.0-20220130.1630
pnpm: 7.18.2
Relevant packages:
next: 13.1.1-canary.1
eslint-config-next: N/A
react: 18.2.0
react-dom: 18.2.0

Which area(s) of Next.js are affected? (leave empty if unsure)

No response

Link to the code that reproduces this issue

https://github.com/promer94/nextjs-middleware-basePath

To Reproduce

pnpm dev

navigate to /sites/zh-CN

Describe the Bug

When user navigate to page /sites/zh-CN

The middleware request will receive a strange url as http://localhost:3000/zh-CN/sites/zh-CN
also middleware request.nextUrl.basePath is different from the nextjs.config.js

Expected Behavior

When user navigate to page /sites/zh-CN

The middleware request should receive url as http://localhost:3000/sites/zh-CN
also middleware request.nextUrl.basePath should be same as nextjs.config.js

Which browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

[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.