Quickly looking at the beta in my free time between work.
With pre-populated data on a default GrandNode 4.40 Beta install, check out "localhost/electronics". Then hover over Nikon D5500 DSLR.
Did not want to create a GitHub issue over this one until I had your feedback.
Is this expected behaviour? See link: http://i64.tinypic.com/2w1s7jr.png
Notice there is no compare or add to wishlist icon for this product. Perhaps expected because it has multiple items attached to it ? i.e. variations on colour.