UMovieSceneTrackInstance::GetWorld() does NOT work properly in Editor

UMovieSceneTrackInstance::GetWorld() returns nullptr on Editor, so user can't use any function using WorldContext and Subsystem.

The following code change may fix this issue

UWorld* UMovieSceneTrackInstance::GetWorld() const
{
#if WITH_EDITOR
    return AnimatedObject ? AnimatedObject->GetWorld() : GEditor->GetEditorWorldContext().World();
#else
    return AnimatedObject ? AnimatedObject->GetWorld() : Super::GetWorld();
#endif
} 

1. Open repro proj
2. Open STI_Test
3. Add LandspaceSubsystem node and Printstring node
4. Connect the nodes
5. Compile

Expect : Compile success
Result : Compile Fail