Loading instanced static mesh causes memory leak in packaged game

void UInstancedStaticMeshComponent::OnPostLoadPerInstanceData()
{
	if (!HasAnyFlags(RF_ClassDefaultObject|RF_ArchetypeObject))
	{
		// create PerInstanceRenderData and pass InstanceDataBuffers ownership to it
#if 0
		InitPerInstanceRenderData(true, InstanceDataBuffers.Release());
#else
		InitPerInstanceRenderData(true, InstanceDataBuffers.Get());
#endif
	}

	// release InstanceDataBuffers
	InstanceDataBuffers.Reset();

void UHierarchicalInstancedStaticMeshComponent::OnPostLoadPerInstanceData()
{
...
			if (!bForceTreeBuild)
			{
				// Create PerInstanceRenderData either from current data or pre-built instance buffer
#if 0
				InitPerInstanceRenderData(true, InstanceDataBuffers.Release());
#else
				InitPerInstanceRenderData(true, InstanceDataBuffers.Get());
#endif
				NumBuiltRenderInstances = PerInstanceRenderData->InstanceBuffer_GameThread->GetNumInstances();
				InstanceCountToRender = NumBuiltInstances;
			}

			// If any of the data is out of sync, build the tree now!
			BuildTreeIfOutdated(bAsyncTreeBuild, bForceTreeBuild);
		}
	}

	InstanceDataBuffers.Reset();
}