getPageMeta not respected in not-found

[cipriancaba]

Verify canary release

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

Provide environment information

Operating System:
      Platform: darwin
      Arch: arm64
      Version: Darwin Kernel Version 22.1.0: Sun Oct  9 20:15:09 PDT 2022; root:xnu-8792.41.9~2/RELEASE_ARM64_T6000
    Binaries:
      Node: 16.17.0
      npm: 8.15.0
      Yarn: 1.22.19
      pnpm: 7.13.1
    Relevant packages:
      next: 13.3.0
      eslint-config-next: 13.3.0
      react: 18.2.0
      react-dom: 18.2.0

Which area(s) of Next.js are affected? (leave empty if unsure)

App directory (appDir: true)

Link to the code that reproduces this issue

https://stackblitz.com/edit/vercel-next-js-hj5fbc?file=app%2Fnot-found.tsx

To Reproduce

Create a not-found page and attempt to generate a meta title or description

Describe the Bug

Meta title and description doesn't work on not-found pages

Expected Behavior

I need to be able to set the not-found page title and description for seo purposes and ux

Which browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

[tiagobarros01]

Same here for error pages.