Null Type Not Working With Enum

[aress31]

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?

mui

Version

5.x

Current Behavior

When defining a property with an enum, e.g.:

{
  "schema": {
    "type": "object",
    "definitions": {
      "status": {
        "enum": ["active", "cancelled", "completed", "inactive", "pending"]
      }
    },
    "properties": {
      // --- SNIP ---
      "status": {
        "type": ["string", "null"],
        "$ref": "#/definitions/status"
      },
      // --- SNIP ---
    }
  },
  "uiSchema": {
    // --- SNIP ---
  }
}

Null values are still not accepted, see:

Expected Behavior

No response

Steps To Reproduce

No response

Environment

Latest everything.

Anything else?

No response