Open Street Map and Bricks. Code r doesn't work

Hi @Peter and thank you for your attention to my problem.
I'm a bit stuck in the process to test the code.
Do I need to export the fields by following the documentation from https://docs.metabox.io/extensions/meta-box-builder/#getting-php-code and paste it in my functions.php? If yes, what next?
Or do I need only test this code in a PHP file?
If yes, how to pass the post (slug? id?) value to render the custom fields values?

<?php
$args = [
    'width'  => '640px',
    'height' => '480px',
];
$group_values = rwmb_meta( 'group_contacts' );
// If group is cloneable
foreach ( $group_values as $group_value ) {
    echo RWMB_Map_Field::render_map( $group_value['contact_map'], $args );
}
?>

I can't really bypass bricks theme because if I do (chosing another theme and create a template), it brokes all the website. I did and ahd a hard time to get it all back.

Hi again @Peter
I did a test directly from a PHP file using the following code, same result:

echo '<h1>Test OSM Maps</h1>';
$args = [
    'width'  => '640px',
    'height' => '480px',
	'zoom'         => 14,
    'marker'       => true
];
$group_values = rwmb_meta( 'group_contacts', '', 204 );
// If group is cloneable
foreach ( $group_values as $group_value ) {
    echo RWMB_Map_Field::render_map( $group_value['contact_map'], $args );
  echo '--------------';
}

The weird part is the maps display for 1 second and are immediatly replaced by a Google Maps message. See the screen record https://www.loom.com/share/e8782b7add2b4038800d970cef7a8bf9

Here his the fields PHP code:

add_filter( 'rwmb_meta_boxes', 'test_mb_palais' );

function test_mb_palais( $meta_boxes ) {
    $prefix = 'palais-';

    $meta_boxes[] = [
        'title'      => __( 'Palais', 'your-text-domain' ),
        'id'         => 'palais',
        'post_types' => ['palais'],
        'fields'     => [
            [
                'name' => __( 'Sous-titre', 'your-text-domain' ),
                'id'   => $prefix . 'text_subtitle',
                'type' => 'text',
            ],
            [
                'type' => 'heading',
                'name' => __( 'Comment y aller', 'your-text-domain' ),
            ],
            [
                'name' => __( 'En train', 'your-text-domain' ),
                'id'   => $prefix . 'textarea_train',
                'type' => 'wysiwyg',
            ],
            [
                'name' => __( 'En avion', 'your-text-domain' ),
                'id'   => $prefix . 'textarea_avion',
                'type' => 'wysiwyg',
            ],
            [
                'name' => __( 'En voiture', 'your-text-domain' ),
                'id'   => $prefix . 'textarea_voiture',
                'type' => 'wysiwyg',
            ],
            [
                'name' => __( 'Juridictions', 'your-text-domain' ),
                'id'   => $prefix . 'textarea_juridictions',
                'type' => 'wysiwyg',
            ],
            [
                'name' => __( 'À découvrir', 'your-text-domain' ),
                'id'   => $prefix . 'textarea_discover',
                'type' => 'wysiwyg',
            ],
            [
                'type' => 'heading',
                'name' => __( 'Contacts et adresses', 'your-text-domain' ),
            ],
            [
                'name'          => __( 'Contacts', 'your-text-domain' ),
                'id'            => $prefix . 'group_contacts',
                'type'          => 'group',
                'collapsible'   => true,
                'default_state' => 'collapsed',
                'clone'         => true,
                'sort_clone'    => true,
                'add_button'    => __( 'Ajouter une adresse', 'your-text-domain' ),
                'fields'        => [
                    [
                        'name' => __( 'Intitulé', 'your-text-domain' ),
                        'id'   => $prefix . 'contact_title',
                        'type' => 'text',
                    ],
                    [
                        'name' => __( 'Adresse', 'your-text-domain' ),
                        'id'   => $prefix . 'contact_address',
                        'type' => 'text',
                    ],
                    [
                        'name' => __( 'Téléphone', 'your-text-domain' ),
                        'id'   => $prefix . 'contact_phone',
                        'type' => 'text',
                    ],
                    [
                        'name' => __( 'Email', 'your-text-domain' ),
                        'id'   => $prefix . 'contact_email',
                        'type' => 'email',
                    ],
                    [
                        'name' => __( 'Horaires', 'your-text-domain' ),
                        'id'   => $prefix . 'contact_opening_hours',
                        'type' => 'wysiwyg',
                    ],
                    [
                        'name' => __( 'Transports en commun', 'your-text-domain' ),
                        'id'   => $prefix . 'contact_public_transportation',
                        'type' => 'wysiwyg',
                    ],
                    [
                        'name'          => __( 'Carte', 'your-text-domain' ),
                        'id'            => $prefix . 'contact_map',
                        'type'          => 'osm',
                        'address_field' => 'contact_address',
                        'language'      => 'fr',
                        'region'        => 'fr',
                    ],
                ],
            ],
        ],
    ];

    return $meta_boxes;
}