In a reply I said I would give your suggestion a whirl. It seems to only be an issue with action bindings. Axis bindings work fine. I came across the same issue in a new project as well. During debug breaks I can see that the size of objects on the stack is 4 for my action bindings (2 actions each of 2 objects). But showing input debug displays only 3 objects on the stack, missing my 2 actors and/or pawns.