Hello,

Please try using the following snippet to Remove and add the wishlist button.

 if ( class_exists( 'XTS\WC_Wishlist\UI' ) ) {
	remove_action( 'woocommerce_single_product_summary', array( XTS\WC_Wishlist\UI::get_instance(), 'add_to_wishlist_single_btn' ), 33 );

	add_action( 'woocommerce_single_product_summary', array( XTS\WC_Wishlist\UI::get_instance(), 'add_to_wishlist_single_btn' ), 20 );
}

Best Regards