Image Select Field only offers first option

I added a Image Select Field with a couple options like so:

value:https://the-million-posts--site.tukutoi.com/wp-content/uploads/2020/12/a5d8ffad-19df-3aa9-9e06-870146871026.jpg
value: https://the-million-posts--site.tukutoi.com/wp-content/uploads/2020/12/a79b4e0b-a842-300a-a503-8288e4e8603c.jpg

I use AIO, and this is the code it generates:

add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );

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

<pre><code>$meta_boxes[] = [
    'title'      => esc_html__( 'Usdfagdhntitled Field Group', 'text-domain' ),
    'id'         => 'usdfagdhntitled-field-group',
    'post_types' => ['post'],
    'context'    => 'normal',
    'priority'   => 'high',
    'fields'     => [
        [
            'id'      => $prefix . 'image_select_8n1slce1j5p',
            'type'    => 'image_select',
            'name'    => esc_html__( 'Image Select', 'text-domain' ),
            'options' => [
                'value' => esc_html__( 'https://the-million-posts--site.tukutoi.com/wp-content/uploads/2020/12/a79b4e0b-a842-300a-a503-8288e4e8603c.jpg', 'text-domain' ),
            ],
        ],
    ],
];

return $meta_boxes;

}

We can see it adds only one option, and that is also what I see in the Post Edit Screen: just one option.

I tried to store the code in the functionsphp and add the other options manually like so

'options' => [
                    'value' => esc_html__( 'https://the-million-posts--site.tukutoi.com/wp-content/uploads/2020/12/a79b4e0b-a842-300a-a503-8288e4e8603c.jpg', 'text-domain' ),
                    'value' => esc_html__( 'https://the-million-posts--site.tukutoi.com/wp-content/uploads/2020/12/537f927b-2c14-3162-8a44-c0ac6c39fc8f.jpg', 'text-domain' ),
                ],

But it still offers only one image.

I have tested this with Theme 2021 and no other plugins…