[React 19] Controlled checkboxes are reset by form submission and form.reset() #31695
Description
Summary
After a form is submitted with an action, if one of the form's fields is a checkbox or radio input controlled by its checked prop, that element is reset as if it were uncontrolled. The same happens when the reset() method is called on the form. (Expected behavior: those fields are not reset.)
import { useState } from "react"
export default function Page() {
const [isChecked, setIsChecked] = useState(false);
return (
<form action={() => {
console.log("hello world!");
}}>
<label>
Some checkbox
<input type="checkbox"
checked={isChecked}
onChange={(e) => {
setIsChecked(e.target.checked);
}}
/>
</label>
<button>Submit form</button>
</form>
);
}Repro: https://codesandbox.io/p/sandbox/checkbox-reset-repro-sff3sr
Related: #30580, reactjs/react.dev#7340