Link to the code that reproduces this issue

https://github.com/tswymer/static-parallel-routes-reproduction

To Reproduce

1. Since this is a caching issue it can only be reproduced in prod mode, so build and start the repo (or https://static-parallel-routes-reproduction.vercel.app/)
2. Observe app root is correctly statically pre-rendered and cached, then click the link to go to "/test"
3. Observe all sections on /test are dynamically rendered

Current vs. Expected behavior

I expected the test/layout.tsx, test/page.tsx and test/@staticRoute/page.tsx pages to be static, but the test/@dynamicRoute/page.tsx seems to cause the entire "/test" path to become dynamic.

Also enabling partial pre-rendering does not change the observed behavior.

app
├── layout.tsx
├── page.tsx (static)
└── test
    ├── @dynamicRoute
    │   └── page.tsx (dynamic)
    ├── @staticRoute
    │   └── page.tsx (expected to be static, is dynamic)
    ├── layout.tsx (expected to be static, is dynamic)
    └── page.tsx (expected to be static, is dynamic)

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.0.0: Mon Aug 12 20:52:12 PDT 2024; root:xnu-11215.1.10~2/RELEASE_ARM64_T6020
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 22.7.0
  npm: 10.8.2
  Yarn: N/A
  pnpm: 8.15.3
Relevant Packages:
  next: 15.0.0-canary.163 // Latest available version is detected (15.0.0-canary.163).
  eslint-config-next: N/A
  react: 19.0.0-rc-e740d4b1-20240919
  react-dom: 19.0.0-rc-e740d4b1-20240919
  typescript: 5.3.3
Next.js Config:
  output: N/A

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

Parallel & Intercepting Routes

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

next build (local), next start (local), Vercel (Deployed), Other (Deployed)

Additional context

No response