Apparently random menu itemids generated in route for joomla tags

-- url of the page with the problem -- : http://joomla_3xxx.lan/index.php?option=com_tags&view=tag&id=2-white-musk&Itemid=381&lang=en
-- HikaShop version -- : 3.2.0
-- Joomla version -- : 3.7.1
-- PHP version -- : 7.1

We are testing the joomla tags with hikashop products. We have have noticed that we don't have single product link under the joomla tag view that has a coherent menu itemid i.e. a menuid that is related in some way to the product . For example we have product #20 that is in category #8. We have menu item with itemid 284 which is a category listing link to category #8.

Under joomla tags listing what menu itemid does it have?

http://www.joomla_3xxx.lan/index.php?option=com_hikashop&ctrl=product&task=show&cid=20&name=spray-white-musk&Itemid=348&lang=en

We don't have a menu item which links directly the product #20 as a product page, but we would expect the route to find the (or a) category the products is in and show the add menu itemid. As it is the menu itemids that are generated don't have any connection with the actual product.

Are we missing something in the configuration?

We done some further tests about the menu Itemid.

We have created some tags for some products. We then view the tag listing with all the products. We don't have any menus linking to products, just to category listings or product listings. The menu Itemids returned don't relate to menu links to category listings that have these products in.

On closer inspection the route it appears to us that the the route finds the first menu with a product listing layout and then returns the first menu Itemid that meets that criteria.

We tried creating a menu which links directly the products but that didn't change anything.

Is there way to assign a fixed menu Itemid to the links for products in joomla tags.

We deleted all our data in hikashop and deleted all hikashop menus including the default hikashop menus that are created when installed.

We then created the follow category hierarchy
product_category
|--->category A
|--->cateogry Z

we put product Test Product in category A and assigned TAG-J
we put product Another Product in category Zand assigned TAG-D

we created 2 category listing menu items.
The link to category A is:
www.joomla3xxx.lan/index.php?option=com_...g&Itemid=169&lang=en

The link to category Z is:
www.joomla3xxx.lan/index.php?option=com_...g&Itemid=296&lang=en

when viewing Test Product which is in category A the URL
www.joomla3xxx.lan/index.php?option=com_...t&Itemid=169&lang=en

when viewing Another product which is in category Z the URL
www.joomla3xxx.lan/index.php?option=com_...t&Itemid=296&lang=en

If we go to view the tag J of Test Product the link on the title is:
www.joomla3xxx.lan/index.php?option=com_...t&Itemid=169&lang=en

If we go to view the tag D of Another Product the link on the title is:
www.joomla3xxx.lan/index.php?option=com_...ther-product&Itemid= 169&lang=en

This is the wrong menu itemid. So the SEF url is incorrect for this product as well the breadcrumb.

I hope the issue is clear now.