Hidden std values not saving in DB

Hi Guys, Not sure what is happening, I have a CF with hidden fields(code bellow) but can´t get the fields to save the standard value "0" in the postmeta database... any help whould be appreciated !!

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

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

    $meta_boxes[] = [
        'title'      => __( 'hidden', 'your-text-domain' ),
        'id'         => 'hidden',
        'post_types' => ['obra'],
        'autosave'   => true,
        'include'    => [
            'relation'  => 'OR',
            'user_role' => ['administrator'],
        ],
        'fields'     => [
            [
                'id'      => $prefix . 'soma_staff_d',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_sd_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_staff_i',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_si_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_emp_d',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_ed_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_emp_i',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_ei_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_equip',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_equip_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_staff_d',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_staff_i',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_emp_d',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_emp_i',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_equip',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_sd_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_si_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_ed_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_equip_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_ei_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_tools',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'soma_tools_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_tools',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
            [
                'id'      => $prefix . 'acum_tools_ht',
                'type'    => 'hidden',
                'columns' => 1,
                'std'     => 0,
            ],
        ],
    ];

    return $meta_boxes;
}

Many thanks