Testing VM 2.9.9.3 on J 2.5.27. See picture for reference to point numbers
1) in cart module, actually the product_sku variable is not processed and is sent to output as varaible text name; also, in my opinion, the right value to be displayed there should be the "product_name", and not the "product_sku"
2) the same in drop-down cart attribute: here the product_sku is correctly processed, but (as noticed above) the drop-down should show the "product_name" and not the "product_sku" (or at least it should be possible to choose what do you like to display, the first one, the second or both of them)
In additition, there is a minor issue loading product son's details when selecting a drop-down cart attribute (where values are produt's sons): if you select one of the drop-down value, you are correctly redirected to the selected son's main page, BUT the drop-down does not maintain the selection you made, and reverts to the basic one, not showing that you have already made a selection. This is wrong, because you may not realize you have already made a selection, and try to make the selection again and again
[attachment cleanup by admin]