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Thanks for the support, actually this works for now. Optimal choise would be ajax for both selects, inside "to" and "from" posts. But for now i'm ok with this solution.

Hello, so i tried but it's not working, here the code i put into functions.php:

add_action('mb_relationships_init', function () {

    $currentPostId = 86323; //how do i get this?
    global $wpdb;
    $filteredIds = [];
    $results = $wpdb->get_results($wpdb->prepare('SELECT * FROM wp_mb_relationships WHERE wp_mb_relationships.to = %s', $currentPostId));
    foreach($results as $result){
        $filteredIds[] = $result->from;
    }

    MB_Relationships_API::register(array(
        'id' => 'episodes_to_series',
        'from' => array(
            'type' => 'post',
            'post_type' => 'episode',
            'admin_column' => true,
            'meta_box' => [
                'context' => 'advanced',
                'title' => 'Serie'
            ]
        ),
        'to' => array(
            'type' => 'post',
            'post_type' => 'serie',
            'meta_box' => [
                'context' => 'advanced',
                'title' => 'Episodes'
            ],
            'query_args' => [ 'post__in' => $filteredIds], //not working
        ),
    ));
});

how do i get $currentPostId ? i tried with $post but without success
why $filteredIds is not working?

I also tried with hard-coded array instead of filteredIds, but nothing

Also, the bug i mentioned on #14776? Some fix is coming soon?

Hi,
thanks for fast reply.

Sadly i can't use the ID's because all 100k posts are related to each other and i can't limit the query.

I need to set this limit to query that populates the select2, instead of showing all options, i need to show/render only the selected option, so the page will load fast because html output will be a lot less.

Any help is appreciated