Link to the code that reproduces this issue

https://github.com/Yummygum/back-navigation-bug

To Reproduce

1. Clone the repository and navigate to the project directory.
2. Install dependencies:

   yarn

3. Build the project:

   yarn build

4. Serve the static files:

   npx serve@latest out

   Alternatively, run the project in development mode:

   yarn dev

5. Manually enter a dog slug URL in the address bar (e.g., /dog/1, /dog/2, or /dog/3).
6. Let the page cycle through the dogs automatically.
7. Press the back button and observe that it leads to a blank new tab page instead of returning to the previous page.
8. Go to the home page and click the button to navigate to Dog 1.
9. Wait for the page to automatically cycle through the dogs every 3 seconds.
10. Use the provided button (Link) to navigate to /dog/1.
11. The browser's back button now sometimes works and sometimes doesn't.

Current vs. Expected behavior

• Expected: Pressing the back button should return to the previous dog page, whether the navigation is manual or automatic.
• Actual: When manually navigating to a dog slug (e.g., /dog/1, /dog/2) and allowing the page to automatically cycle through dogs, pressing the back button always leads to a blank new tab page instead of returning to the previous page.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:24 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6030
  Available memory (MB): 18432
  Available CPU cores: 11
Binaries:
  Node: 22.14.0
  npm: 10.9.2
  Yarn: 1.22.22
  pnpm: N/A
Relevant Packages:
  next: 15.3.0-canary.33 // Latest available version is detected (15.3.0-canary.33).
  eslint-config-next: N/A
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.8.2
Next.js Config:
  output: export

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

Dynamic Routes

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

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

Additional context

No response