Can't name checkout page "/checkout/" with SEF

-- HikaShop version -- : 2.6.0_2015-11-05_06-23-29
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.3.10

If checkout_itemid is set to a page with the alias "checkout", the router strips this when trying to load checkout/notice/cart_type-cart/tmpl-component for the add-to-cart popup... then attempts to load a non existent "notice" controller.

Menu Structure:
- Shop (index.php?option=com_hikashop&view=category&layout=listing)
- Checkout (index.php?option=com_hikashop&view=checkout&layout=step)

Add To Cart produces 404 popup.
current page url: shop/category/mycategory
updatecart: shop/product/updatecart/tmpl-component

popup url: shop/checkout/notice/cart_type-cart/tmpl-component
- which has shop/checkout stripped and looks for "notice" controller.