Add button of array prop does nothing, if array items are anyOf/oneOf

[straygar]

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

5.8.0

Current Behavior

Given a schema:

{
  "type": "object",
  "required": [
    "root"
  ],
  "properties": {
    "root": {
      "type": "object",
      "properties": {
        "arrayProp": {
          "type": "array",
          "items": {
            "anyOf": [
              {
                "type": "null"
              },
              {
                "type": "string",
                "default": "abc"
              }
            ]
          }
        }
      }
    }
  }
}

Pressing the "Add" button of arrayProp does nothing.

If I specify "default": null in items, the add button works. I would expect it to default to the first item, which rjsf does if an anyOf/oneOf is not an array item.

Expected Behavior

A new item is created, defaulting to the first value of "anyOf" (null).

Steps To Reproduce

See playground link

original playground link

Environment

- OS:
- Node:
- npm:

Anything else?

No response

[nickgros]

I updated the playground link to use the provided schema, which demonstrates the issue.

Good catch, this is definitely a bug, a new item with value null should be created in formData. We maintainers are short-handed at the moment. @straygar , would you be willing to make a PR with our guidance and review?