OneOf with antd theme render as multiple selector

[Plokkke]

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?

antd

Version

5.x

Current Behavior

When defining a root level oneOf property with antd them. rjsf render a broken multiple select.

bug is available in official playground using this schema

{
  "title": "A registration form",
  "description": "A simple form example.",
  "type": "object",
  "oneOf": [
    {
      "title": "Contact",
      "properties": {
        "telephone": {
          "type": "string",
          "title": "Telephone",
          "minLength": 10
        }
      }
    },
    {
      "title": "Identity",
      "properties": {
        "firstName": {
          "type": "string",
          "title": "First name",
          "default": "Chuck"
        },
        "lastName": {
          "type": "string",
          "title": "Last name"
        }
      }
    },
    {
      "title": "Address",
      "properties": {
        "firstName": {
          "type": "string",
          "title": "Street"
        },
        "lastName": {
          "type": "string",
          "title": "City"
        }
      }
    }
  ]
}

Expected Behavior

The rendered component should be a single selector or a multiple selector UI with the limitation of only one selected item

Steps To Reproduce

1. Go to official playground
2. Copy provided schema or select oneOf in predefined section
3. Select default theme
4. Try to open selector and switch between options (Working)
5. Select antd theme
6. Try to open selector and switch between options (Broken)

Environment

- OS: MacOS
- Navigator: Chrome 112
- Node: irelevant
- npm: irelevant

Anything else?

No response

[Plokkke]

In file packages/antd/src/widgets/SelectWidget/index.tsx on line 86, the following line can be found:
mode={typeof multiple !== 'undefined' ? 'multiple' : undefined}
considering false as a truthy value for multiple display.

I suggest the following replacement:
mode={multiple ? 'multiple' : undefined}