Wysiwyg id in group

Hello,

I have 2 groups, and in each group a wysiwyg Field. Like so :

add_filter( 'rwmb_meta_boxes', 'my_meta_boxes' );

function my_meta_boxes( $meta_boxes ) {

	$prefix = 'custom_';
	
	$meta_boxes[] = array(
	
		'id'		=>	$prefix . 'box',
	    'title'		=>	'My metabox',
		'pages' 	=>	array( 'page' ),
		'context' 	=>	'normal',
		'priority' 	=>	'low',
		
		'fields'	=> array(
	    
	    	array(
		
	            'name'	=>	'My first group',
	            'id'	=>	$prefix . 'group_1',
	            'type'	=>	'group',
	            
	            'fields'		=>	array(
	            
	                array(
	                
	                    'name'	=>	'Text',
	                    'id'	=>	'text',
	                    'type'	=>	'wysiwyg',
	                ),
	                
	            ),
			),
	    
	    	array(
		
	            'name'	=>	'My Second group',
	            'id'	=>	$prefix . 'group_2',
	            'type'	=>	'group',
	            
	            'fields'		=>	array(
	            
	                array(
	                
	                    'name'	=>	'Text',
	                    'id'	=>	'text',
	                    'type'	=>	'wysiwyg',
	                ),
	                
	            ),
			),
        ),
	);
	
	return $meta_boxes;
}

The wysiwyg of the second group is broken and doesn't display properly :

Any idea ? Thanks