On versions 5.14.0 / 3.10.0 (AIO), my field shows no results and the console shows a select2 error: this.generateResultId is not a function
Using version 5.13.1 / 3.9.0 (AIO) this still works, so I assume the select2 library update broke something.
The field is configured to show WooCommerce products like this:
array(
'id' => $prefix . 'author_featured_products',
'type' => 'post',
'name' => esc_html__( 'Featured products', 'nsv-cpt' ),
'post_type' => 'product',
'field_type' => 'select_advanced',
'clone' => true,
'sort_clone' => true,
'max_clone' => 3,
),