Link to the code that reproduces this issue

https://github.com/MangoMarcus/nextjs-draft-mode-empty-search-params

To Reproduce

1. Clone the repository and spin up locally with npm i and npm run dev
2. Use the two buttons at the top to toggle draft mode on and off
3. The 'token' parameter shows 'undefined' when draft mode is off, and 'foo' when it's on
4. Deploy to Vercel, or use mine: https://nextjs-draft-mode-empty-search-params.vercel.app/?token=foo
5. Use the buttons again - the 'token' parameter shows 'undefined' when draft mode is off, but also 'undefined' when it's on

Current vs. Expected behavior

Locally the token correctly displays as 'foo' with draft mode enabled, but on Vercel it's 'undefined'. Vercel should also show 'foo'.

Interestingly there's also a discrepancy between urlPathname and isRevalidate between local and vercel shown in the screenshots below

Local - dev mode (npm run dev)

Draft mode disabled

Draft mode enabled

Local - production build (npm run build && npm start)

Draft mode disabled

Draft mode enabled

Vercel

Draft mode disabled

Draft mode enabled

Provide environment information

Operating System:
  Platform: macOS
  Chip: Apple M1 Pro
  Version: macOS 14.4
Binaries:
  Node: 20.2.0
  npm: 9.6.6
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 14.2.4
  eslint-config-next: N/A
  react: 18.3.1
  react-dom: 18.3.1
  typescript: 5.5.3
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Output (export/standalone), Runtime

Which stage(s) are affected? (Select all that apply)

Vercel (Deployed)

Additional context

The problem might stem from the search parameter being accessed dynamically, depending on if draft mode is enabled.

If draft mode is enabled then the page is rendered dynamically and dynamic features like search parameters and cookies should be available. If it's disabled, then it's rendered statically and all search parameters should returned undefined.

My example shows that draft mode is correctly enabled - and therefore the page is being rendered dynamically at request time - but the dynamic features are not available.

Edit: Added local production build examples