TextScale parameter doesn't change size of text in AddOnScreenDebugMessage()

The textScale parameter in AddOnScreenDebugMessage does not change the scale of the debug message.

1. Open a Basic Code C++ project
2. Create a C++ class that extends from Actor named MyActor
3. Include the Engine/Engine.h file to  MyActor.cpp 
4. Add this code snippet to the Tick function of MyActor.cpp: 

   if (GEngine)
   	{
   		GEngine->AddOnScreenDebugMessage(1, DeltaTime, FColor::Cyan, TEXT("Stuff and Stuff"), true, FVector2D(5.0f, 5.0f));
   	}

1. Compile and Run the project
2. PIE

Result: The scale of the text is still its default size

Expected: The size of the debug message would be larger

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