Cannot use 'in' operator to search for '$ref' in undefined in fixed arrays

[A11oW]

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

5.13.2

Current Behavior

If I use fixed Array and provide extended data in formData props I get exception: "Cannot use 'in' operator to search for '$ref' in undefined"

For example:

JSONSchema:

{
  "type": "object",
  "properties": {
    "scoreEntries": {
      "type": "array",
      "items": [
        {
          "properties": {
            "scorePercent": {
              "type": "number"
            }
          }
        }
      ]
    }
  }
}

formData:

{
  "scoreEntries": [
    {
      "scorePercent": 10032
    },
    {
      "scorePercent": 10032
    }
  ]
}

And if I remove last item from formData array, then this work good

Expected Behavior

When passing additional data in formData, ignore it and proxy it to the submit

Steps To Reproduce

No response

Environment

- OS: Ubuntu 20.04
- Node: 20.5.0
- npm: 9.8.1

Anything else?

Playground