meta-box Metabox group: wysiwyg does not display content after moving

Issue Overview

Content of wysiwyg field is not displayed after moving, if the field is dropped at the same place as before moving it.

Steps to Reproduce (for bugs)

Add the following code to functions.php:

add_filter('rwmb_meta_boxes', 'meta_box_group_demo_register');
function meta_box_group_demo_register($meta_boxes)
{
    $meta_boxes[] = array(
        'title'  => 'Demo group',
        'fields' => array(
            array(
                'id'     => 'standard',
                'type'   => 'group',
                'clone'  => true,
                'sort_clone' => true,
                'fields' => array(
                    array(
                        'name' => 'Demo field',
                        'id' => 'demo-field',
                        'type' => 'wysiwyg',
                        'options' => array(
                            'textarea_rows' => 4,
                        ),
                    )
                ),
            ),
        ),
    );
    return $meta_boxes;
}

Create a post.
Add content to demo field.
Click 'Add more'
Add content to second demo field.
Pick up the first demo field.
Drop the field at the same spot as where it was picked up.

Expected Behavior

Expect to the content to display, as before moving it.

Current Behavior

The content of the field is not displayed. Selecting the field content reveals that the content is actually still there. Possible workaround: first clicking the "text" button and then clicking the "visual" button solves the problem.