Code not working with updated version

Hi with the new version of the MB settings page plugin I have a problem that I did not have with the previous one.

In version 1.3.4 I set this code to get a dynamic checkbox list controlled through the setting page:

<?php
/*------------------------------------*\
    SETTING PAGE
\*------------------------------------*/
add_filter( 'mb_settings_pages', 'settings_pages' );
function settings_pages( $settings_pages ) {

    $settings_pages[] = array(
        'id'            => 'options',
        'menu_title'    => 'Settings',
        'title'         => 'Option page',
        'option_name'   => 'options',
        'icon_url'      => 'dashicons-images-alt',
        'submenu_title' => 'Option page',
        
        'tabs'        => array(
            'allergens'  => 'Allergens',
        ),
    );
    return $settings_pages;
}

add_filter( 'rwmb_meta_boxes', 'options_meta_boxes' );
function options_meta_boxes( $meta_boxes ) {

    $meta_boxes[] = array(
        'id'                =>  'allergens',
        'title'             =>  'Allergens',
        'settings_pages'    =>  'options',
        'tab'               =>  'allergens',

        'fields'    =>  array(
            array(
                'id'      => 'list',
                'name'    => 'List',
                'type'    => 'text',
                'clone' => true,
                'add_button' => '+ More',
            ),
        ),
    );
    
    return $meta_boxes;
}
    

# ============================== #
# ===    METABOX - FIELDS    === #
# ============================== #

add_filter( 'rwmb_meta_boxes', 'mbfieldse_list' );
function mbfieldse_list( $meta_boxes ) {

    $allergens = rwmb_meta( 'list', array( 'object_type' => 'setting' ), 'options' );

    if ($allergens) {
        //Combine Array
        $listallergens = array_combine($allergens, array_values($allergens));
    } else {
        // if $allergens is empty
        $listallergens = null;
    }

    $meta_boxes[] = array(
        'title'          => 'My List',
        
        'fields' => array(

                    array(
                        'name'    => 'List',
                        'id'      => 'allergensList',
                        'type'    => 'checkbox_list',
                        'options' => $listallergens,

                        'select_all_none' => true,
                        
                    ),
                ),                
            ),
        ),
    );
    
    return $meta_boxes;
    
}

With MB setting page v1.3.4 everything worked fine, but updating the plugin to v2.1.3 the variable $allergens remains empty (NULL).

Maybe I am wrong something?