Out-of-stock not working if over 30 variations

Hi!

If the product has more that 30 variation, the out-of-stock (X over picture) does not work. It might be an Ajax problem. I use theme Astra and ajax filters. I tried this function, but it did not help.

function iconic_wc_ajax_variation_threshold( $qty, $product ) {
return 50;
}

add_filter( ‘woocommerce_ajax_variation_threshold’, ‘iconic_wc_ajax_variation_threshold’, 10, 2 );

Sanna