How to include the ‘current-menu-ancestor’ class on a custom post type menu in WordPress?

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This is the final working code:

<?php
function additional_active_item_classes($classes = array(), $menu_item = false){
global $wp_query;

if(in_array('current-menu-item', $menu_item->classes)){
    $classes[] = 'current-menu-item';
}

if ( $menu_item->post_name == 'product' && is_post_type_archive('product') ) {
    $classes[] = 'current-menu-item';
}

if ( $menu_item->post_name == 'product' && is_singular('product') ) {
    $classes[] = 'current-menu-item';
}


return $classes;
}
add_filter( 'nav_menu_css_class', 'additional_active_item_classes', 10, 2 );

?>

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