Meshs in a hidden sublevel may generate incorrect navmesh

void FNavigationDataHandler::UpdateActorAndComponentsInNavOctree(AActor& Actor)
{
	INavRelevantInterface* NavElement = Cast<INavRelevantInterface>(&Actor);
	if (NavElement)
	{
		UpdateNavOctreeElement(Actor, *NavElement, FNavigationOctreeController::OctreeUpdate_Default);
	}

	for (UActorComponent* Component : Actor.GetComponents())
	{
		INavRelevantInterface* CompNavElement = Cast<INavRelevantInterface>(Component);
		if (CompNavElement)
		{
			// Component != null is implied by successful INavRelevantInterface cast 
			if (Actor.IsComponentRelevantForNavigation(Component) && Component->bNavigationRelevant ) //this line
			{
				UpdateNavOctreeElement(*Component, *CompNavElement, FNavigationOctreeController::OctreeUpdate_Default);
			}
			else
			{
				UnregisterNavOctreeElement(*Component, *CompNavElement, FNavigationOctreeController::OctreeUpdate_Default);
			}
		}
	}