Can’t Callback Roles in Registration Form

I tried to Callback UM Roles in Role Dropdown, but get some issue.

What I did ?

• Add “Role Dropdown” in Registration Form
• Add callback : role_select_choices_callback
• Add Parent Option ( Parent option is a dropdown with options : Membre de bureau, Bienfaiteur & Entreprise)
• Added this code to my Function.php :
  

function role_select_choices_callback( $has_parent = false ) {

	// choices array.
	$all_options = array(
		"Membre de bureau" => array(
			"Direction"     => "Direction"
		),
		"Bienfaiteur" => array(
			"Etudiant" => "Etudiant",
			"Bienfaiteur" => "Bienfaiteur"
		),
		"Entreprise" => array(
			"Donnateur"    => "Donnateur",
			"Sponsor" => "Sponsor"
		),
	);

	// get values from the parent field, sent via the AJAX post.
	$parent_options = isset( $_POST['parent_option'] ) ? $_POST['parent_option'] : array();
	if ( ! is_array( $parent_options ) ) {
		$parent_options = array( $parent_options );
	}

	// get related options for the parent field choice.
	$arr_options = array();
	if ( empty( $parent_options ) ) {
		foreach ( $all_options as $k => $opts ) {
			$arr_options = array_merge( $opts, $arr_options );
		}
	} else {
		foreach ( $parent_options as $parent_option ) {
			if ( isset( $all_options[$parent_option] ) ) {
				$arr_options = array_merge( $arr_options, $all_options[$parent_option] );
			}
		}
	}

	// Optional. Display this if there are no related options for this choice.
	if ( empty( $arr_options ) ) {
		$arr_options[] = 'No role found';
	}

	return array_unique( $arr_options );
}

After checking Console I found this error :

Uncaught TypeError: Cannot read properties of undefined (reading 'default')
    at d (um-scripts.min.js?ver=2.8.8:1:10530)
    at Object.success (um-scripts.min.js?ver=2.8.8:1:11647)
    at c (jquery.min.js?ver=3.7.1:2:25304)
    at Object.fireWith [as resolveWith] (jquery.min.js?ver=3.7.1:2:26053)
    at l (jquery.min.js?ver=3.7.1:2:77782)
    at XMLHttpRequest.<anonymous> (jquery.min.js?ver=3.7.1:2:80265)

To make sure callback and parent options works good:

I added a simple Dropdown with the same settings (callback + Parent Option) and it works fine. But it can’t register user with the choosen Role.

System Info :

• PHP : 8.1
• All plugins are updated