Join Field doesn't work with multiple collections?

Describe the Bug

When a join field is given a array of collections it does not show anything anymore.

Link to the code that reproduces this issue

https://github.com/MartijnDeRoode/payload/tree/bug/join-array/test/_community

Reproduction Steps

1. Grab the rpo
2. pnpm dev _community
3. Navigate to Tags collection
4. See the join field empty.

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

area: core, area: ui

Environment Info

Binaries:
  Node: 22.3.0
  npm: N/A
  Yarn: N/A
  pnpm: 9.7.0
Relevant Packages:
  payload: 3.43.0
  next: 15.3.0
  @payloadcms/db-mongodb: 3.43.0
  @payloadcms/email-nodemailer: 3.43.0
  @payloadcms/graphql: 3.43.0
  @payloadcms/next/utilities: 3.43.0
  @payloadcms/payload-cloud: 3.43.0
  @payloadcms/richtext-lexical: 3.43.0
  @payloadcms/translations: 3.43.0
  @payloadcms/ui/shared: 3.43.0
  react: 19.1.0
  react-dom: 19.1.0
Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Home
  Available memory (MB): 65375
  Available CPU cores: 24