Overriding Serialize() does not work for WIDGETS

Development Programming & Scripting C++
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4

And just in case anyone interested wants to see the code making the changes and serializing the values, here are the (most pertinent) chunks of the C++
(Note, this is taken from the AActor class, which works as expected. But the code is basically the same in the UWidget/UUserWidget class):

// Header 
class TESTIT_API ATestActor : public AActor
{
public:
	ATestActor();

	UPROPERTY(EditAnywhere, Category="Testing")
	FString SomeText;

	int32 ANumber = 0;

	FString AnotherString = TEXT("Default String Value");

	TArray<uint8> AnArray = {1, 2, 3, 4, 5, 6, 7, 8};

	virtual void Serialize(FArchive& Ar) override;

#if WITH_EDITOR

public:
	UFUNCTION(CallInEditor, Category="Testing")
	void Process();
	
#endif
};

// CPP File

void ATestActor::Serialize(FArchive& Ar)
{
	Super::Serialize(Ar);

	Ar << ANumber;
	Ar << AnotherString;
	Ar << AnArray;
}

void ATestActor::Process()
{
	Modify();
	ANumber       = 2345;
	AnotherString = TEXT("XXXXXXXXX");
	AnArray.Empty();
	for (uint8 i = 100; i < 110; ++i)
	{
		AnArray.Add(i);
	}
}