oneOf + const is handled differently when nested in a property vs as a root object property

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?

mantine

Version

6.3.1

Current Behavior

It's possible there's something I don't understand about JSON Schema or RJSF here, but this seems like a bug to me.

This is with the following feature flag:

experimental_defaultFormStateBehavior={{
  constAsDefaults: 'always',
}}

The first schema will have the behavior of enforcing food equals "fish" if animal equals "Cat". Even if the user uses the dropdown to select a different value, it forces it back to the const value. The second schema is essentially the same schema, except nested inside a property nested. The above behavior is no longer observed.

Validation is not broken, but the UX behavior changes.

Working playground with the schema below:

{
  "type": "object",
  "properties": {
    "animal": {
      "enum": [
        "Cat",
        "Fish"
      ]
    },
    "food": {
      "type": "string",
      "enum": [
        "meat",
        "grass",
        "fish"
      ]
    }
  },
  "allOf": [
    {
      "if": {
        "properties": {
          "animal": {
            "const": "Cat"
          }
        }
      },
      "then": {
        "properties": {
          "food": {
            "const": "fish"
          }
        },
        "required": [
          "food"
        ]
      }
    },
    {
      "required": [
        "animal"
      ]
    }
  ]
}

Bugged playground with the schema below:

{
  "type": "object",
  "properties": {
    "nested": {
      "type": "object",
      "properties": {
        "animal": {
          "enum": [
            "Cat",
            "Fish"
          ]
        },
        "food": {
          "type": "string",
          "enum": [
            "meat",
            "grass",
            "fish"
          ]
        },
        "allOf": [
          {
            "if": {
              "properties": {
                "animal": {
                  "const": "Cat"
                }
              }
            },
            "then": {
              "properties": {
                "food": {
                  "const": "fish"
                }
              },
              "required": [
                "food"
              ]
            }
          },
          {
            "required": [
              "animal"
            ]
          }
        ]
      }
    }
  }
}

Expected Behavior

Consistent UX behavior whether the allOf is the root object or a nested object property.

Steps To Reproduce

Observable in the plaground via the two links above

Environment

- OS: Windows 11
- Node: 22.13.1
- npm: 11.7.0

Anything else?

No response