Next.js 15 <Link> scroll to top does not work if loading.tsx is present

[LoV432]

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/youthful-davinci-xs9gmf

To Reproduce

1. Run the server in production mode (npm run build && npm run start).
2. Navigate to the "/withloading" page.
3. Scroll to the bottom and click the "Next" button.
4. The page does not scroll to the top.

Current vs. Expected behavior

The page should scroll to the top when pressing the "Next" and "Previous" buttons on the "withloading" page, but it does not.

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Sun Aug  6 20:05:33 UTC 2023
  Available memory (MB): 8198
  Available CPU cores: 4
Binaries:
  Node: 20.9.0
  npm: 9.8.1
  Yarn: 1.22.19
  pnpm: 8.10.2
Relevant Packages:
  next: 15.1.1-canary.24 // Latest available version is detected (15.1.1-canary.24).
  eslint-config-next: N/A
  react: 19.0.0-beta-04b058868c-20240508
  react-dom: 19.0.0-beta-04b058868c-20240508
  typescript: 5.1.3
Next.js Config:
  output: N/A

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

Navigation

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

next start (local)

Additional context

This bug only occurs with next start and not with next dev. It is also present only in Next.js 15 and works fine in Next.js 14. As far as I know, it doesn't matter what is returned by loading.tsx, as returning anything at all will result in this bug.

[alexmarqs]

Having the same issue with Nextjs 15. Just replaced my loading files by Suspense's inside my layouts/pages as workaround.