Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
      Platform: darwin
      Arch: x64
      Version: Darwin Kernel Version 22.5.0: Thu Jun  8 22:22:22 PDT 2023; root:xnu-8796.121.3~7/RELEASE_X86_64
    Binaries:
      Node: 18.16.1
      npm: 9.8.0
      Yarn: 1.22.19
      pnpm: N/A
    Relevant Packages:
      next: 13.4.10-canary.3
      eslint-config-next: 13.4.9
      react: 18.2.0
      react-dom: 18.2.0
      typescript: 5.1.6
    Next.js Config:
      output: N/A

Which area(s) of Next.js are affected? (leave empty if unsure)

App Router

Link to the code that reproduces this issue or a replay of the bug

https://github.com/zoogeny/next-js-interceptor-parallel-dynamic

To Reproduce

Checkout, install the project and run the dev server

git checkout https://github.com/zoogeny/next-js-interceptor-parallel-dynamic.git   
cd next-js-interceptor-parallel-dynamic
npm install
npm run dev

Load a page in the blog (e.g. http://localhost:3000/blog/first-post) and you will see a basic interface:

params.slug: first-post
Same dir
Nested dir

If you click the Nested dir link you will correctly get a parallel slot rendered below the links with a red border. If you click within the border the slot will be removed.

If you click the Same dir link you will navigate the entire page. This is not expected - it should be intercepted and render inside the parallel slot.

Describe the Bug

It appears that interception of routes within the same directory does not work. e.g. I have a directory structure as follows:

app
  /blog
    /[slug]
      page.tsx
    /@modal
      /(.)[slug]
        page.tsx
      /(.)summary
        /[slug]
          page.tsx
      default.tsx
    layout.tsx
    page.tsx

While I am on the blog/some-page page I can intercept <Link> to blog/summary/another-page but I cannot intercept <Link> to blog/another-page.

Expected Behavior

When on a page blog/some-page I would expect to be able to intercept <Link> to blog/another-page using a folder at blog/@modal/(.)[slug].

The purpose of this is to show summary modals for blog entries without navigating away from the current page.

Which browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response