Bug: Compare Versions not working for tabs

Describe the Bug.

The "Compare versions" UI are not showing the fields in a document with tabs. Look at how the diff tool shows the information about changed fields in collapsed mode, but when expanded, all lines are empty. Below is also proof of the two versions in the DB.

Reproduction Steps

Add a collection with tabs. In a tab, add simple text fields.

Save a text fields. Go to versions. Try to compare.

Environment Info

Binaries:
  Node: 22.16.0
  npm: 10.9.2
  Yarn: N/A
  pnpm: 9.10.0
Relevant Packages:
  payload: 3.68.5
  next: 15.5.9
  @payloadcms/db-mongodb: 3.68.5
  @payloadcms/email-nodemailer: 3.68.5
  @payloadcms/graphql: 3.68.5
  @payloadcms/live-preview: 3.68.5
  @payloadcms/live-preview-react: 3.68.5
  @payloadcms/next/utilities: 3.68.5
  @payloadcms/payload-cloud: 3.68.5
  @payloadcms/plugin-redirects: 3.68.5
  @payloadcms/plugin-seo: 3.68.5
  @payloadcms/richtext-lexical: 3.68.5
  @payloadcms/translations: 3.68.5
  @payloadcms/ui/shared: 3.68.5
  react: 19.2.3
  react-dom: 19.2.3
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.6.0: Mon Jul 14 11:29:54 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T8122
  Available memory (MB): 16384
  Available CPU cores: 8