extraErrors continually getting merged into the internal state after calling mergeObjects with concatArrays true

[dagda1]

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 or a shared playground link demonstrating the issue.

What theme are you using?

material-ui

Version

5.0.0-beta.12

Current Behavior

The extraErrors are continually merged into the <Form>'s internal state from the onChange handler.

I have narrowed it down to this line and this code:

      const errorSchema = extraErrors
        ? (mergeObjects(newErrorSchema, extraErrors, true) as ErrorSchema<T>)
        : newErrorSchema;

Here is a video of it happening

cccc.mp4

If I set the last argument of mergeObjects to false, then everything works as expected

const errorSchema = extraErrors ? mergeObjects(newErrorSchema, extraErrors, false) : newErrorSchema;

Setting it to false makes sense in my naive brain because of this line in mergeObjects

    } else if (concatArrays && Array.isArray(left) && Array.isArray(right)) {
      acc[key] = left.concat(right);

If newErrorSchema looks like this:

{{
    "repoOwner": {
        "__errors": [
            "Mandatory Field"
        ]
    }
}

And extraErrors looks like this:

{
    "repoName": {
        "__errors": [
            "Mandatory Field"
        ]
    },
    "repoOwner": {
        "__errors": [
            "Mandatory Field"
        ]
    }
}

Then the call to mergeObjects with the true third argument will produce this:

{
    "repoName": {
        "__errors": [
            "Mandatory Field"
        ]
    },
    "repoOwner": {
        "__errors": [
            "Mandatory Field",
            "Mandatory Field"
        ]
    }
}

And so on.

Should mergeObjects be called with false?

Expected Behavior

If the 3rd argument to mergeObjects is set to false:

mergeObjects(newErrorSchema, extraErrors, false)

Then it works as it should

bbbb.mp4

Steps To Reproduce

1. Access this codesandbox
2. click submit
3. start typing in the last name field

Environment

- OS: osx monterry
- Node: v16.17.0
- npm: 8.19.

Anything else?

No response

[heath-freenome]

Duplicate of #3169