Dynamic routes don't work correctly with basePath

[PolinaJSN]

Verify canary release

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

Provide environment information

Operating System:
Platform: win32
Arch: x64
Version: Windows 10 Pro
Binaries:
Node: 16.16.0
npm: N/A
Yarn: N/A
pnpm: N/A
Relevant packages:
next: 12.3.3
eslint-config-next: 11.1.4
react: 17.0.2
react-dom: 17.0.2

What browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

Describe the Bug

When any basePath added in next.config, rewrites for dynamic paths don't work
As fallback: true is used, the first time page loads without props and then the props are passed

Expected Behavior

Without basepath rewrites for dynamic paths work and pages load with proper content from the first time

Link to reproduction - Issues with a link to complete (but minimal) reproduction code will be addressed faster

https://stackblitz.com/edit/vercel-next-js-hxjczp?file=pages%2Fnews%2F[slug].tsx,next.config.js,pages%2Findex.tsx

To Reproduce

1. Pate https://vercel-next-js-hxjczp-xlov6swr--3000.local-credentialless.webcontainer.io/nl/nieuws/some-url in the search input - you will see THIS SHOULD NOT APPEAR and than This should appear. If it was too fast you can check the preview of this page in networks (see screenshot)
   

2. 1. Comment basePath in next.config
   2. Restart project
   3. Paste https://vercel-next-js-hxjczp-xlov6swr--3000.local-credentialless.webcontainer.io/nieuws/some-url.
      You will see only This should appear on the page. Preview in networks:
      

[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.