InnerBlocks doesn't work anymore on 1.26 on Rest API

Hi,

I update from 1.25.x to 1.26.2 and inside Rest API of wordpress, <InnerBlocks /> is not interprated.

It's ok on the editor, it's ok on standard webpage but on Rest API it's not.

Screenshot from Gutenberg

Screenshot from website

Screenshot from Rest API

add_filter( 'rwmb_meta_boxes', function( $meta_boxes ) {
    $meta_boxes[] = [
        'title'           => 'Hero Content',
        'id'              => 'hero-content',
        'description'     => 'A custom hero content block',

        // Block settings.
        'type'            => 'block',
        'icon'            => 'awards',
        'category'        => 'layout',
        'context'         => 'side',
        'render_callback' => function($attributes){
            echo '<header>'.$attributes['title'].'</header><section><InnerBlocks /></section>';
        },
        'enqueue_style'   => get_template_directory_uri() . '/blocks/hero/style.css',
        'supports' => [
            'align' => ['wide', 'full'],
        ],

        // Block fields.
        'fields'          => [
            [
                'id'   => 'title',
                'name' => 'Title',
            ],
        ],
    ];
    return $meta_boxes;
} );

General informations
This test come from a new wordpress from scratch.
Edit first article, push the code inside functions.php of twentytwentyfour

Wordpress Version : 6.5.2
Meta Box: 5.9.7
MetaB Box AIO: 1.26.2 (only MB Block activated)
Theme Twenty Twenty-Four 1.1
PHP 8.2.18 (came from docker image)

Activated plugins
Meta Box
Meta Box AIO

If I switch to meta box aio 1.25 all is fine