Hide Other Shipping Methods

I created a Free shipping method with this plugin, and I followed the documentation (https://docs.woocommerce.com/document/hide-other-shipping-methods-when-free-shipping-is-available/ for 3.0+) to hide other shipping methods when the its conditions are met, but it’s not working. Other methods (from the native Woocommerce settings) are still showing up.

Here’s the code I’m using:

function my_hide_shipping_when_free_is_available( $rates ) {
	$free = array();
	foreach ( $rates as $rate_id => $rate ) {
		if ( 'shipping_method_0_pisol_extended_flat_shipping9093' === $rate->method_id ) {
			$free[ $rate_id ] = $rate;
			break;
		}
	}
	return ! empty( $free ) ? $free : $rates;
}
add_filter( 'woocommerce_package_rates', 'my_hide_shipping_when_free_is_available', 100 );

I saw the id is this, from the dev tools: shipping_method_0_pisol_extended_flat_shipping9093

What am I doing wrong?…