How to display Metabox.io image in Gutenberg?

Hi Support,

I am using the following code to insert a custom single-image field in WordPress Posts.

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'   => __( 'Post Pin', 'your-text-domain' ),
        'id'      => 'post-pin',
        'context' => 'side',
        'closed'  => true,
        'fields'  => [
            [
                'name'              => __( 'Title Pin', 'your-text-domain' ),
                'id'                => $prefix . 'title_pin',
                'type'              => 'single_image',
                'label_description' => __( 'Post Pin for Pinterest', 'your-text-domain' ),
                'force_delete'      => true,
            ],
        ],
    ];

    return $meta_boxes;
}

After this, I am using WP Stackable's image block to display the image. But it is not working - simply displays a blank image container.

Any solution please?

Kind regards,