int64 UProperty with ExposeOnSpawn meta tag won't compile.

int64 UProperty with ExposeOnSpawn meta tag won't compile from a C++ UUserWidget class.

1. Create a new C++ Project in UE 4.24.3
2. Create a new C++ Class based on UUserWidget.
3. Within the header file declare the following

UCLASS()
class BUGSUBTEST_API UMyUserWidget : public UUserWidget
{
GENERATED_BODY()

protected:

UPROPERTY(BlueprintReadOnly, meta = (ExposeOnSpawn = true))
int64 userId;
};

 
4. Compile

Result: Error: ExposeOnSpawn - Property cannot be exposed

Expected: Successful Compile