Route caching not working when forced

Link to the code that reproduces this issue

https://cache-test-inky.vercel.app/api/user/1/bookmarks

To Reproduce

Load the URL and note the date in the currentTimestamp
Refresh fast and the datestamp stays the same
Give it a few seconds and then refresh and the timestamp is updated again

Current vs. Expected behavior

I would expect this to be a static response all the time.

Code_2FgFns9KmM

Verify canary release

[X] I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 10 Pro
Binaries:
  Node: 18.17.1
  npm: N/A
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 13.5.6
  eslint-config-next: 14.0.0
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.2.2
Next.js Config:
  output: N/A

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

App Router

Additional context

I am exploring the caching of API routes to ensure DB requests are not called on highly used route endpoings.

I have DB calls with unstable_cache and a tag against then and then a User endpoint where I use the userId in the URL. My aim here is to static cache the users endpoint where internally I make 4 separate cached calls to the db for separate pieces of information.

I am exploring that the users endpoint is cached all the time, until I run revalidateTag to clear 1 of the data calls and then run revalidatePath to clear the statically generated user response.

In my testing all 4 tagged calls get cleared when I revalidate the path, so was doing some testing here and it seems none of it seems to work in this way.

We could not detect a valid reproduction link. Make sure to follow the bug report template carefully.

Why was this issue closed?

To be able to investigate, we need access to a reproduction to identify what triggered the issue. We need a link to a public GitHub repository (template for App Router, template for Pages Router), but you can also use these templates: CodeSandbox: App Router or CodeSandbox: Pages Router.

The bug template that you filled out has a section called "Link to the code that reproduces this issue", which is where you should provide the link to the reproduction.

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What should I do?

Depending on the reason the issue was closed, you can do the following:

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My repository is private and cannot make it public

In most cases, a private repo will not be a sufficient minimal reproduction, as this codebase might contain a lot of unrelated parts that would make our investigation take longer. Please do not make it public. Instead, create a new repository using the templates above, adding the relevant code to reproduce the issue. Common things to look out for:

Remove any code that is not related to the issue. (pages, API routes, components, etc.)
Remove any dependencies that are not related to the issue.
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Remove any environment variables that are not related to the issue.
Remove private packages that we do not have access to.
If the issue is not related to a monorepo specifically, try to reproduce the issue without a complex monorepo setup

I did not open this issue, but it is relevant to me, what can I do to help?

Anyone experiencing the same issue is welcome to provide a minimal reproduction following the above steps by opening a new issue.

I think my reproduction is good enough, why aren't you looking into it quickly?

We look into every Next.js issue and constantly monitor open issues for new comments.

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vercel / next.js