Custom cacheHandler doesn't revalidate page by revalidatePath

[eposha]

Link to the code that reproduces this issue

https://github.com/eposha/cache-handler-revalidate-path

To Reproduce

0. Set up a cache handler (Implementing the same functions as the example)
1. npm run build
2. npm start
3. open browser on http://localhost:3000/
4. Try to Path revalidate and Unstable revalidate
5. Look at the terminal

Current vs. Expected behavior

Current behavior - Receive TypeError: Cannot read properties of undefined (reading 'some')
Expecte behavior - Revalidate path and unstable_cache

I think the problem is that the cached html page doesn't include the tag

Provide environment information

Operating System:
  Platform: darwin
  Arch: x64
  Version: Darwin Kernel Version 24.4.0: Wed Mar 19 21:16:34 PDT 2025; root:xnu-11417.101.15~1/RELEASE_ARM64_T6000
  Available memory (MB): 16384
  Available CPU cores: 10
Binaries:
  Node: 22.14.0
  npm: 11.2.0
  Yarn: 1.22.10
  pnpm: 8.8.0
Relevant Packages:
  next: 15.3.0 // Latest available version is detected (15.3.0).
  eslint-config-next: 15.3.0
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.8.3
Next.js Config:
  output: N/A

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

Not sure

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

next start (local)

Additional context

If you add export const dynamic = force-dynamic to page then unstable_cache will revalidate the request as expected

[eposha]

In this branch https://github.com/eposha/cache-handler-revalidate-path/tree/fix/get-cache-from-headers.

I take the tags for the page from data?.headers?[‘x-next-cache-tags’] in cache-handler.js. After that it worked, but I'm not sure if it's the right solution or not

[emin-alizada]

Same here

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