In WooCommerce 3.4.1 the Gutenberg for products has been disabled. Here is a code if you want to activate it.


function wplook_activate_gutenberg_products($can_edit, $post_type){
	if($post_type == 'product'){
		$can_edit = true;
	}
	
	return $can_edit;
}
add_filter('gutenberg_can_edit_post_type', 'wplook_activate_gutenberg_products', 10, 2);