Switching between two oneOf option returns undefined form data

[altpd13]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

core

Version

5.2.0

Current Behavior

Using this json Schema

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "ExecuteMsg",
  "oneOf": [
    {
      "type": "object",
      "required": [
        "increment"
      ],
      "properties": {
        "increment": {
          "type": "object"
        }
      },
      "additionalProperties": false
    },
    {
      "type": "object",
      "required": [
        "reset"
      ],
      "properties": {
        "reset": {
          "type": "object",
          "required": [
            "count"
          ],
          "properties": {
            "count": {
              "type": "integer",
              "format": "int32"
            }
          }
        }
      },
      "additionalProperties": false
    }
  ]
}

when form is first initialized formData is {increment: {}} and when I change to reset formData is set to {increment: undefined, reset: {}} and again when change to increment formData is {increment: undefined, reset: undefined}

Expected Behavior

When changing back to option increment It should be {increment: {}} not {increment: undefined, reset: undefined}

Steps To Reproduce

https://rjsf-team.github.io/react-jsonschema-form/#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

Environment

- OS: Mac Sonoma 14.5
- Node: 20.0.0
- npm: 9.6.4
- yarn: 1.22.22

Anything else?

No response

[nickgros]

Looks like a duplicate of #3711 ?

[altpd13]

Thank you @nickgros for reading my issue
But I'm afraid the behavior #3711 is different from my behavior.

The current behavior I've mentioned is when changing back to oneOf element which requires empty object property results undefined value.
So for example I want a formData that have empty value(e.g {increment: {}} on submit. The initial formData when Form first renders is set as exactly what I wanted it to be({increment: {}}). But changing to other oneOf element and changing back to increment element will set the formData to {increment: undefined, reset: undefined} not {increment: {}, reset: undefined}.

I wish this information would helps you understand

[nickgros]

We're also seeing the issue in #3977 in this playground, but not sure if fixing that will fix this

[altpd13]

Seems like it is fixed!
People who are having this issue use this experimental feature
https://rjsf-team.github.io/react-jsonschema-form/docs/api-reference/form-props/#mergedefaultsintoformdata