Calling a function that returns TWeakObjectPtr in blueprints causes crash

Calling a code defined function in blueprints that returns a TWeakObjectPtr causes a crash.

1. Open UE4 Editor
2. Add code to project based on Actor (AMyActor)
3. In the header file add the following:

UFUNCTION(BlueprintCallable, Category="test")
 TWeakObjectPtr<AActor> ReturnWeakObject();

4. In the source file add the following:

TWeakObjectPtr<AActor> AMyActor::ReturnWeakObject()
 {
     auto Actor = GetWorld()->SpawnActor<AStaticMeshActor>();
     return TWeakObjectPtr<AActor>(Actor);
 }

5. Compile
6. Create blueprint based on AMyActor
7. Enable Input on Begin Play
8. Add WeakObjectPtr node and connect to key press event (T)
9. PIE and press T

Result:
Editor immediately crashes

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