C++ property is missing from blueprint if project is launched from Launcher

Development Pipeline & Plugins Editor Scripting
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1

.h

USTRUCT(BlueprintType)
struct FTestData
{
	GENERATED_BODY()

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		float TestValue;
};

UCLASS()
class FIXIKIVR_API ATestGameModeBase : public AGameModeBase
{
	GENERATED_BODY()
	
public:
	ATestGameModeBase();

	void InitConfigValues();

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Init)
	FTestData TestData;
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Init)
	float TestFloat;
};

.cpp

ATestGameModeBase::ATestGameModeBase() : Super()
{
	this->InitConfigValues();
        this->TestFloat = 5;
}

this->InitConfigValues() initializes TestData. If this is built and launched from VisualStudio it all works fine, but if the project is launched from Epic Games Launcher or by double-clicking .uproject file the TestFloat variable is missing, TestData is there but initialized with zeros and is in the wrong category.

2

Apparently you have to build with DevelopmentEditor configuration to make variables appear when you launch project from Launcher.