BP node value changes if function parameter default value changes.

When a C++ function parameter has a default value, changing the default value will change any blueprint node of the function where the value is manually set.

Regression:
Yes - changing the default value of a function parameter does not change the blueprint node value in 4.16.3 (CL 3561208)

1. Open UE4 Editor (any project)
2. Add code to project based on Actor (MyActor)
3. Add the following to MyActor.h:

   UFUNCTION(BlueprintCallable, Category = test)
   		void ACoolFunction(bool Thing = false);
   

4. Add the following to MyActor.cpp:

   void AMyActor::ACoolFunction(bool Thing /* = false */)
   {
   
   }
   

5. Compile
6. Create a blueprint based on MyActor (MyActorBP)
7. Add ACoolFunction call to event graph
   • Note the bool checkbox is false
8. Save / Close the project
9. In Visual Studio, change Thing = false to Thing = true in MyActor.h
10. Compile
11. Reopen the project / blueprint

Result:
The bool checkbox is set to true after latest compile.

Expected:
Checkbox retains previous setting