Lexical editor is readonly when using drag and drop for relation upload field

Describe the Bug

When using a type: 'upload' field with a relation to another collection (e.g. relationTo: 'media'), the drag and drop functionality makes the lexical rich text editor to be readonly in the editing drawer.

This is not an issue if clicking "Create New" in the Cover Image field and/or creating a Media manually and then selecting an existing one. From my testing, this only applies to drag and dropping the image in a relational field.

Seems to be related to some older issues like #9363 and #8691. Haven't been able to find a workaround for it yet though.

Link to the code that reproduces this issue

https://github.com/szeckirjr/testing-payload2

Reproduction Steps

1. Clone the repo
2. cd testing-payload2
3. Copy .env.local into .env
4. pnpm install
5. pnpm dev
6. Open http://localhost:3000/admin
7. Login with test@example.com and 123456789
8. Click on Projects collection and create a new project
9. In the “Cover Image” section, drag and drop an image into the field
10. Notice the Caption Lexical Editor field is readonly and uneditable

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

area: ui
plugin: richtext-lexical

Environment Info

Binaries:
  Node: 22.15.0
  npm: 10.9.2
  Yarn: 1.22.22
  pnpm: 10.7.1
Relevant Packages:
  payload: 3.47.0
  next: 15.3.2
  @payloadcms/email-nodemailer: 3.47.0
  @payloadcms/graphql: 3.47.0
  @payloadcms/next/utilities: 3.47.0
  @payloadcms/payload-cloud: 3.47.0
  @payloadcms/richtext-lexical: 3.47.0
  @payloadcms/translations: 3.47.0
  @payloadcms/ui/shared: 3.47.0
  react: 19.1.0
  react-dom: 19.1.0
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.0.0: Tue Sep 24 23:37:25 PDT 2024; root:xnu-11215.1.12~1/RELEASE_ARM64_T6030
  Available memory (MB): 18432
  Available CPU cores: 12