assetPrefix with same name of route with catch-all segments won't work since 14.2 (Using Page Router)

[yanni-fe]

Link to the code that reproduces this issue

https://github.com/yanni-fe/nextjs-reproduce-demo

To Reproduce

1. Create a next.js project
2. Create a test route with catch-all segments

 pages
    |- demo
        |- [[...slug]].tsx

3. add assetPrefix with same name of route

// next.config.js
const nextConfig = {
    assetPrefix: '/demo',
}

open localhost:3000/demo will return 404

Current vs. Expected behavior

For versions before 14.2, it works well. After updating next.js to 14.2.3, it fails.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 22.5.0
Binaries:
  Node: 18.17
  npm: 9.8.1
  Yarn: 1.22.19
Relevant Packages:
  next: 14.2.3
  eslint-config-next: 14.2.3
  react: 18.3.1
  react-dom: 18.3.1
  typescript: 5.1.3
Next.js Config:
  output: N/A

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

Pages Router

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

next dev (local), next start (local)

Additional context

I think this is caused by this commit 4efe142

changes in packages/next/src/server/lib/router-utils/filesystem.ts at line 438