Bug when adding ACF fields programmatically

If I add ACF fields programmatically within my plugin with the following code, the ACF-VC INTEGRATOR SETTINGS popup looks like this (there are two Field name selects):

Field group (i)
Test group 1 (selected)
Test group 2

Field name
Test2 (only one item in the list)

Field name
Test2 (only one item in the list)

If I change the Field group, nothing happens with both “Field name” select fields. “Test2” stays the only item in both selects. If I assign the second field group to another post type, it stil does not work.

add_action('acf/init', 'add_my_custom_fields');

function add_my_custom fields() {
    acf_add_local_field_group(array(
        'key' => 'test_grp1',
        'title' => __( 'Test group 1', 'test'),
        'menu_order' => 0,
        'location' => array (
            array (
                array (
                    'param' => 'post_type',
                    'operator' => '==',
                    'value' => 'page',
                ),
            ),
        ),
        'fields' => array(
            array(
                'key' => 'field_page_test1',
                'label' => __( 'Test1', 'test'),
                'name' => 'page_test1',
                'type' => 'text',
            )
        )
    ));

    acf_add_local_field_group(array(
        'key' => 'test_grp2',
        'title' => __( 'Test group 2', 'test'),
        'menu_order' => 1,
        'location' => array (
            array (
                array (
                    'param' => 'post_type',
                    'operator' => '==',
                    'value' => 'page',
                ),
            ),
        ),
        'fields' => array(
            array(
                'key' => 'field_page_test2',
                'label' => __( 'Test2', 'test'),
                'name' => 'page_test2',
                'type' => 'text',
            )
        )
    ));
}