here is the correct hook and the way to get for a specific product category archive page, the default sorting by "Newness":
add_filter( 'woocommerce_get_catalog_ordering_args', 'custom_catalog_ordering_args', 20, 1 );
function custom_catalog_ordering_args( $args ) {
$product_category = 't-shirts'; // <== HERE define your product category
// Only for defined product category archive page
if( ! is_product_category($product_category) ) return $args;
// Set default ordering to 'date ID', so "Newness"
$args['orderby'] = 'date ID';
if( $args['orderby'] == 'date ID' )
$args['order'] = 'DESC'; // Set order by DESC
return $args;
}
Code goes in function.php file of your active child theme (or active theme). Tested and works.
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