Interface as a function parameter does not get set unless class directly inherits the interface

When a function takes an interface as a parameter, calling that function from a blueprint implementing the interface does not recognize the parameter unless the blueprint's parent class directly inherits the interface.

Regression:
No- behavior occurs in 4.14.3 binary (Cl 3249277)

1. Open attached project
2. PIE & Press "Y"
   • note "NewBlueprint_### is printed to screen (newListener is set)
3. In VS, open MyActor.h
4. Comment out `, public ITestInterface`
5. Compile
6. In the editor, open TestActor
7. Click Class Settings and Add Test Interface in Details panel
8. Compile TestActor
9. PIE & Press Y

Result:
newListener variable is not set

Expected:
When the blueprint implements the interface, calling function recognizes value passed in as interface reference

Interface as parameter on call from Blueprint to C++