WooCommerce - Increase the variations threshold

<?php
  // WooCommerce - Increase the variations threshold (the default is usually 30)
  // Credit: mohsinoffline
  // User kanlailey reported this doesn't work if the WooCommerce Stripe plugin is active
  add_filter( 'woocommerce_ajax_variation_threshold', 'custom_variation_threshold', 10, 2 );
  function custom_variation_threshold( $default, $product ) {
    return 60; // set this number to your maximum number of variations
  }