woocommerce_evaluate_shipping_cost_args filter

Hi,

In the WOOMULTI_CURRENCY_F_Frontend_Shipping class, the woocommerce_evaluate_shipping_cost_args filter is utilized
https://plugins.trac.ww.wp.xz.cn/browser/woo-multi-currency/trunk/frontend/shipping.php#L206

but is passed only two arguments instead of the expected three:
https://plugins.trac.ww.wp.xz.cn/browser/woocommerce/trunk/includes/shipping/flat-rate/class-wc-shipping-flat-rate.php#L84

This discrepancy arises because the plugin overrides the default flat rate calculation method and does not include the shipping method information in the mentioned filter. As a result, we are unable to incorporate additional costs from the Flexible Shipping plugin.