Dynamic Modal Interception is Greedy

[khuezy]

Link to the code that reproduces this issue

https://github.com/khuezy/next-modal-bug

To Reproduce

1. npm install
2. npm run dev
3. Go to localhost:3000/gallery
4. Click on /gallery/dynamic
5. See dynamic route modal interception
6. Go back
7. Click /gallery/static
8. See that the static route is intercepted when it shouldn't

Current vs. Expected behavior

Modal Interception intercepts static routes as dynamic.

/app
  /gallery
    /[dynamic]
      page.tsx
    /static
      page.tsx
    /@modal
      /[dynamic]
        page.tsx

When linking to /gallery/static, the modal interceptor intercepts it as /gallery/[dynamic].

Without "@modal", the /gallery/static is processed before the /gallery/[dynamic]route. But with "@modal" interception, it is intercepting the /gallery/static path as [dynamic]

So with that, the expectation of "@modal" route interception is the same. "@modal" should not intercept static routes.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 23.0.0: Fri Sep 15 14:41:43 PDT 2023; root:xnu-10002.1.13~1/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 22.6.0
  npm: 10.8.2
  Yarn: N/A
  pnpm: 9.7.0
Relevant Packages:
  next: 15.0.0-canary.173 // Latest available version is detected (15.0.0-canary.173).
  eslint-config-next: N/A
  react: 18.3.1
  react-dom: 18.3.1
  typescript: 5.6.2
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 dev (local)

Additional context

No response

[abhi12299]

Does this only happen during next dev?

Update: this also happens on next start.