Recommendation without category
I am wondering how recommendation engine able to recommend products without category. I am capturing the common entity parameters like id, name, image etc but not capturing the category as it is not available on any of the product page. I created a sample activity with recommended for you criteria based on last viewed item. When I access the activity on any product page in incognito, the recommendation appears with exactly same category.
Eg. car Tyre PDP page will show all the Tyre items, Car light page will show all the light items.