Parallel Routes often lead to unexpected routing behavior

[magnusriga]

Link to the code that reproduces this issue

https://github.com/magnusriga/app-playground

To Reproduce

1. Start app: next dev
2. Click on the Impressions link under the @views slot
3. Click on the Home link under the @views slot
4. Click on the Demographics link under the @Audience slot
5. Click on the Home link under the @Audience slot
6. Watch that last click take the children slot back to the /impressions route
7. Click on the Home link under the @Audience slot one more time
8. Watch that last click take the children slot back to the / (home) route

Current vs. Expected behavior

Sometimes it changes slots other than the one navigated in, to seemingly incorrect places. See steps above to reproduce one such case.

Beyond the example given in the "To Reproduce" section, it often exhibits odd behavior. Run the dev server and click around for a while and you will soon enough see the oddities. I.e. if you continue to click around for a while, it will start changing routes in more than one slot, when clicking links inside another slot.

Verify canary release

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

Provide environment information

Running next's own playground with the latest package versions, in a dev container.

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

App Router

Additional context

No response

[maxch-aa]

I can reproduce the issue. A related issue: #58180

[magnusriga]

@jw-vercel , or someone else from the team, when you have a minute, could you please confirm (or reject) that this is indeed a bug?

It seems Parallel Routes is not working as it should, which is a problem for us and other companies relying on stable Next.js features in production.

Thanks a million!