Verify canary release

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

Provide environment information

Operating System:
      Platform: darwin
      Arch: x64
      Version: Darwin Kernel Version 22.5.0: Mon Apr 24 20:53:44 PDT 2023; root:xnu-8796.121.2~5/RELEASE_ARM64_T8103
    Binaries:
      Node: 18.13.0
      npm: 9.8.1
      Yarn: 1.22.10
      pnpm: N/A
    Relevant packages:
      next: 13.4.7
      eslint-config-next: 13.4.1
      react: 18.2.0
      react-dom: 18.2.0
      typescript: 5.0.4

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

Metadata (metadata, generateMetadata, next/head)

To Reproduce

Open Vercel website on /about page, open devtools 'Elements' tab, open search input with cmd + F and type initialCanonicalUrl, you will see this in one of the <script> tags:
... \"initialCanonicalUrl\":\"/app-future/en/about\", ...

Open /app-future/en/about and see that you get the same page!

Describe the Bug

Actual page path and initialCanonicalUrl are different.
Our SEO department reported this problem to us, as they said it confuses the search engine robots (don't ask me why) and reduce SEO optimization points.
For our case it looks like:
/blog/example-article – actual page path at English locale
/en/blog/example-article – initialCanonicalUrl from <script>

Expected Behavior

/blog/example-article – actual page path at English locale
/blog/example-article – initialCanonicalUrl from <script>

Which browser are you using? (if relevant)

Google Chrome

How are you deploying your application? (if relevant)

No response