Unable to use json field when version is on for page.

[krishnasinghdev]

Describe the Bug

I am trying to use a JSON field for page schemas, where it will be generated by default using the afterChange hook or user can enter the JSON data, but I get a Mongoose validation error when version (draft) mode is on. It says that cast to embed failed. It is working fine when I am removing the page versions mode.

using pnpm version-> 10.4.0

Link to the code that reproduces this issue

https://github.com/krishnasinghdev/bug-report/

Reproduction Steps

Input any json value to the schema field and click on save button.

This is will give error "something went wrong." and below error in terminal.

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

area: core

Environment Info

Binaries:
  Node: 22.12.0
  npm: N/A
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  payload: 3.23.0
  next: 15.1.5
  @payloadcms/db-mongodb: 3.23.0
  @payloadcms/email-nodemailer: 3.23.0
  @payloadcms/graphql: 3.23.0
  @payloadcms/next/utilities: 3.23.0
  @payloadcms/payload-cloud: 3.23.0
  @payloadcms/richtext-lexical: 3.23.0
  @payloadcms/translations: 3.23.0
  @payloadcms/ui/shared: 3.23.0
  react: 19.0.0
  react-dom: 19.0.0
Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Home Single Language
  Available memory (MB): 7853
  Available CPU cores: 8

[r1tsuu]

This looks like an edge case for fields named "schema" because it's a reserved name somewhere. I'll look into that further, for now if you rename it to something else it should work.

[krishnasinghdev]

Thanks Sasha, It is working now.