Taxonomy Relationship - Taxonomy Field

Hey,

I have connected two taxonomies.

Example:

City A
City B
= District 1

City C
City D
= District 2

Now I have a CPT in which 2 fields are "City" and "District".
If you select City A, District 1 should be automatically selected or displayed as the only option.

I thought I could do this with simple query_args, but it doesn't seem to work. Where is the error?

add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = 'schulamt_';
    $meta_boxes[] = [
        'title'      => __( 'Daten', 'your-text-domain' ),
        'id'         => 'schwimmhalle',
        'post_types' => ['schwimmhalle'],
        'fields'     => [
            [
                'name'        => __( 'Stadt', 'your-text-domain' ),
                'id'          => $prefix . 'stadt',
                'type'        => 'taxonomy',
                'taxonomy'    => ['stadt'],
                'field_type'  => 'select',
                'placeholder' => __( 'Stadt auswählen', 'your-text-domain' ),
            ],
            [
                'name'        => __( 'Schulamt', 'your-text-domain' ),
                'id'          => $prefix . 'schulamt',
                'type'        => 'taxonomy',
                'field_type'  => 'select',
                'placeholder' => __( 'Schulamt auswählen', 'your-text-domain' ),
                'query_args'  => [
                    'relationship' => [
                        'id'   => 'schulamt-stadt',
                        'from' => get_the_ID(),
                    ],
                ],
            ],
        ],
    ];

return $meta_boxes;
}