Interface Message Call does not work correctly with ExpandEnumAsExecs meta specifier

When using ExpandEnumAsExecs for the execution of a BlueprintImplementableEvent in a C++ interface, if the interface function is called by message, the result will always be as though you executed the first element of the enum and ignore the other inputs. See the attached project's code and TestBP / Level Blueprint for more information

Regression?: No
This also occurred in 4.17

1. Download the attached project
2. Generate project files, compile, and open the project
3. Press play
   Result: On a timer, print strings are displayed. Although it is alternating, the MessageCall always returns Activated unlike the NormalCall which alternates between Activated and Deactivated
   Expected: On a timer, print strings are displayed. Both MessageCall and NormalCall alternate between Activated and Deactivated