[BUG] Static chunks for dynamic App Router routes using %255B fail with 404 in Cloudflare Worker

[RahavLussato]

Describe the bug

I'm using next@15.3.4 with App Router and deploying to Cloudflare Workers using @open-next/cloudflare (following the official guide). When I have a dynamic route like [entityId], Next.js generates static chunks with double-encoded filenames, e.g.:
/_next/static/chunks/app/dashboard/creator/%255BentityId%255D/page-xxx.js

But at runtime, that request fails with a 404. It looks like the Cloudflare Worker decodes %255B to %5B, so it looks for:
/_next/static/chunks/app/dashboard/creator/%5BentityId%5D/page-xxx.js

—which doesn’t exist.

Confirmed:

• Works in Next.js 14.2.5 (which doesn’t use double-encoded paths)
• The file exists in .open-next/assets/... with %255B in the name
• Only one request is made (not a fallback issue)

Steps to reproduce

1. Create a new Next.js app with next@15.3.4 using the App Router.
2. Add a dynamic route like: app/dashboard/entity/[entityId]/page.tsx
3. Deploy the app to Cloudflare Workers using open-next following: https://opennext.js.org/cloudflare/get-started
4. Visit any route that matches the dynamic path, e.g.: https://yourdomain.com/dashboard/creator/123
5. Open DevTools → Network tab, and observe:

• The browser requests a static chunk like:
  /static/chunks/app/dashboard/creator/%255BcreatorId%255D/page-xxxxx.js

• The request fails with 404

6. Check .open-next/assets/_next/static/chunks/app/... and verify that the file does exist using the double-encoded name.

Expected behavior

The Worker should preserve the raw encoded path when matching static chunk files, to support dynamic route segments in Next.js 15.

@opennextjs/cloudflare version

1.4.0

Wrangler version

4.24

next info output

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 20.18.0
  npm: 10.8.2
  Yarn: 1.22.19
  pnpm: 9.12.1
Relevant Packages:
  next: 15.3.4 // There is a newer version (15.3.5) available, upgrade recommended! 
  eslint-config-next: N/A
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.8.3
Next.js Config:
  output: N/A
 ⚠ There is a newer version (15.3.5) available, upgrade recommended!

Additional context

No response

[vicb]

Could you please attach a minimal repro as a link to github repository.
Thanks