Adding a "Section" field causes a form validation error

[superextinct]

Describe the bug

Saving a form with a newly added "Section" field fails due to a validation error:

// admin/action/formie/forms/save

{
    "success": false,
    "errors": {
        "rows": [
            {
                "fields": [
                    {
                        "handle": [
                            "„06b0dbc4441c0da97700177c2735c6f6“ isn’t a valid handle."
                        ]
                    }
                ]
            }
        ]
    },
    // …
}

There is no way to update the handle in the field's settings:

Steps to reproduce

1. Add a section field to a form
2. Save the form

Form settings

• Multi-page form: Regardless
• Submission Method: Regardless
• Client-side Validation: Regardless
• Custom Form Templates: Regardless

Craft CMS version

5.9.12

Plugin version

3.1.15

Multi-site?

No

Additional context

No response

[engram-design]

Fixed for the next release. To get this early, run composer require verbb/formie:"dev-craft-5 as 3.1.15".

[superextinct]

Thank you, much appreciated!

[engram-design]

Updated in 3.1.16.