rwmb_get_registry() in network context

Hi everyone @Metabox.io,

I'm trying to use rwmb_get_registry() to get all the id of my differents meta_boxes in a network context. But all i can print is the array of blog_id 1, not the second one (that uses a different themes)

My metabox AIO is up to date, and i call various meta boxes from php files

<?php
require_once('../../../../../../../../wp-load.php');
switch_to_blog(2);
$theme = wp_get_theme();

print_r($theme->name);//good theme name so i'm sure i've switch

$meta_box_registry = rwmb_get_registry('meta_box');
$meta_boxes = $meta_box_registry->all();

print_r($meta_boxes);//print metaboxes array from blog_id 1

Any clues ?

Thanks for your help
Kevin