Found an older thread regarding issues with the mouse pointer in UE4 while streaming. Currently i am experiancing the same issue.
The Arks different points of interests cant be accessed. Hoovering the shops is not recognized, and clicking them does nothing.
I understand that this must be an issue pretty far down the priority chain, even tho it makes the game unplayable for us with couch-comps. Especially if the issue stems from the engine. Perhaps i might suggest a manual way to traverse the shops in the Ark, and other game menus, perhaps by tab/RB/LB+space/A?