Array field infinite duplication issue (3.58.0)

[jakobpevec]

Describe the Bug

Hi!

I have a nested array field inside a block. When duplicating any array item or array item within it will create an additional nested array item within. Issues also happen when trying to fill in values or delete duplicated items.

Link to the code that reproduces this issue

https://github.com/jakobpevec/payload-locale-filter-bug-repro/tree/infinite-duplication

Reproduction Steps

Use branch "inifnite-duplication" on the reproduction repo.

This is initial structure:

Block
Athlete
Participation
Result

After duplicating Participation this is the structure afterwards

Block
Athlete
Participation
Result
Participation
Result
Result -> try to delete this one and also try selecting a value. Another will be created.

If you try to delete duplicate Result it will reappear instantly. If you click on a value for duplicated item, a new one appears.

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

area: ui

Environment Info

Binaries:
  Node: 20.18.1
  npm: 10.8.2
  Yarn: N/A
  pnpm: 10.15.0
Relevant Packages:
  payload: 3.58.0
  next: 15.4.7
  @payloadcms/email-nodemailer: 3.58.0
  @payloadcms/graphql: 3.51.0
  @payloadcms/next/utilities: 3.58.0
  @payloadcms/payload-cloud: 3.58.0
  @payloadcms/richtext-lexical: 3.58.0
  @payloadcms/translations: 3.58.0
  @payloadcms/ui/shared: 3.58.0
  react: 19.1.0
  react-dom: 19.1.0
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:40 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6041
  Available memory (MB): 49152
  Available CPU cores: 14