Compatibilty with fees currency in checkout

Hello,

It seems the plugin is not compatible with additional fees when added in checkout, this happens with multiple plugins and also if added munually by the woocommerce API cart -> add_fee() the price of the fees does not get multiplied by the currency multiplier when changing the currency and only the currency symbol changes.

Is there at lesst a way to get current current selected currency or the multiplier from the base currency from php side?