Items in group field are out of order

When using the group field within the block editor, items do not appear in the order they are output to the screen on the front-end. This appears to happen when you have a cloneable group that you can sort.

In my case the order in the block editor does not match the array output on the front-end.

$meta_boxes[] = [
        'title'           => 'Highlighted Content',
        'id'              => 'highlighted-content',
        'description'     => 'Showcases highlighted content on the homepage in the full-width content module.',
        'icon'            => 'pressthis',
        'category'        => 'homepage',
        'keywords'        => ['highlighted'],
        'supports'        => [
            'align' => ['full'],
        ],
        'render_template' => get_template_directory() . '/includes/blocks/highlighted-content/block-template.php',
        'type'            => 'block',
        'context'         => 'side',
        'fields'          => [
            [
                'name'              => 'Section Title',
                'id'                => 'title',
                'type'              => 'text',
                'label_description' => 'Leave blank if you do not want a title for the section.',
            ],
            [
                'name'     => 'Background',
                'id'       => 'background',
                'type'     => 'select',
                'default'  => 'is-brand',
                'options'  => [
                    'is-brand' => 'Brand',
                    'is-light' => 'Light',
                ],
            ],
            [
                'name'     => 'Image Size',
                'id'       => 'image_size',
                'type'     => 'select',
                'options'  => [
                    'rectangle' => 'Rectangle',
                    'square' => 'Square',
                ],
                'required' => true,
            ],
            [
                'name'   => 'Posts',
                'id'     => 'posts',
                'type'   => 'group',
                'group_title' => '{highlighted_post}',
                'clone' => true,
                'sort_clone' => true,
                'max_clone' => 8,
                'fields' => [
                    [
                        'name'              => 'Post',
                        'id'                => 'highlighted_post',
                        'type'              => 'post',
                        'label_description' => 'Select an item to display.',
                        'post_type'         => [
                            'post',
                            'page',
                            'contests',
                            'galleries',
                            'shows',
                            'videos',
                            'tribe_events',
                        ],
                        'field_type'        => 'select_advanced',
                        'query_args'        => [
                            'number' => 5,
                        ],
                        'js_options' => [
                            'minimumInputLength' => 4,
                        ],
                    ],
                ],
            ],
        ]
    ];