Dismiss notices on item removal

Updating from woocommerce 2.6.* to 3 broke something on cart page as follows:
I have a custom function checking cart items, as some cannot be shipped to certain destinations. I add a notice with wc_add_notice(‘text’, ‘error’) to prevent checkout until the item is removed. Clicking the red x to remove the item does not trigger an update of the div containing the notice/error/success message, which still appears on screen on top of the “item remove, undo?”. Applying a coupon triggers correctly the div update and the deletion of messages. I assume this is AJAX related, as dequeueing wc_cart solves the issue.
Function code as follows (mostly copied from the interwebs, works fine with previous version of woocommerce!):

function blocco_checkout() {
	
	// set the slug of the category for which we disallow checkout
	$cat1 = 'test';
	
	// get destination state from shipping calculation form
	$paese = WC()->customer->get_shipping_country();
	$paesi_no = array('AU','CA','JP','IT');//da integrare?
	//unico $stato non accettato al momento è Utah, quindi non importa fare array
	
	
	// get the product category
	$prod_cat1 = get_term_by( 'slug', $cat1, 'product_cat' );
	
	// sanity check to prevent fatals if the term doesn't exist
	if ( is_wp_error( $prod_cat1 ) ||  is_wp_error( $prod_cat2 ) ||  is_wp_error($prod_cat3) ) {
		return;
	}
	
	$cat1_name = '<a href="' . get_term_link( $cat1, 'product_cat' ) . '">' . $prod_cat1->name . '</a>';
	
	// check if this category is in the cart
	if ( prod_non_spedibili( $cat1 ) && $paese == 'IT' ) {		
		// render a notice to explain why checkout is blocked
		//wc_add_notice( sprintf( 'Hi there! Looks like your cart contains products from the %1$s category &ndash; unfortunately they cannot be shipped to your destination.', $cat1_name ), 'error' );
		wc_add_notice( sprintf( 'Hi there! Looks like your cart contains products from the %1$s category &ndash; unfortunately they cannot be shipped to your destination.', $cat1_name ), 'error' );
	}
	
}
add_action( 'woocommerce_check_cart_items', 'blocco_checkout' );