`locale: 'all'` with Local API not updating localized fields.

Describe the Bug

When using the locale: 'all' option in the local update API all fields get updated except for the localized ones.

Link to the code that reproduces this issue

https://github.com/MartijnDeRoode/payload-reproductions

Reproduction Steps

1. Clone the repository
2. Install dependencies & run
3. Create a post through the admin panel
4. Go to http://localhost:3000/api/post/test/{id}, this will randomly generate a string and put it in all 3 fields. (1 normal and 2 localized.)
5. Check the response or the admin panel. You will find that only the first text field is updated.

Which area(s) are affected?

area: core

Environment Info

Binaries:
  Node: 22.17.0
  npm: N/A
  Yarn: N/A
  pnpm: 9.7.0
Relevant Packages:
  payload: 3.83.0
  next: 16.2.3
  @payloadcms/db-mongodb: 3.83.0
  @payloadcms/graphql: 3.83.0
  @payloadcms/next/utilities: 3.83.0
  @payloadcms/richtext-lexical: 3.83.0
  @payloadcms/translations: 3.83.0
  @payloadcms/ui/shared: 3.83.0
  react: 19.2.4
  react-dom: 19.2.4
Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Home
  Available memory (MB): 65375
  Available CPU cores: 24

Start by cloning the linked payload-reproductions repository and following its setup and reproduction steps for the local API endpoint at /api/post/test/{id}. Trace how locale: 'all' is handled during the update, then verify that both localized fields update alongside the normal field in the response and admin panel.