TurretAuthoring does not add URPMaterialPropertyBaseColor component

[sijoonlee]

TurretAspect is looking for Turret + URPMaterialPropertyBaseColor component like below

EntityComponentSystemSamples/EntitiesSamples/Assets/Tutorials/Tanks/Step 4/TurretAspect.cs

Lines 14 to 18 in f22bb94

	readonly RefRO<Turret> m_Turret;
	// Used in Step 8. Making this Optional means instances of the aspect
	// can represent entities which do not have this component.
	readonly RefRO<URPMaterialPropertyBaseColor> m_BaseColor;

However, URPMaterialPropertyBaseColor's not added here

EntityComponentSystemSamples/EntitiesSamples/Assets/Tutorials/Tanks/Step 2/TurretAuthoring.cs

Lines 20 to 26 in f22bb94

	AddComponent(entity, new Turret
	{
	CannonBallPrefab = GetEntity(authoring.CannonBallPrefab, TransformUsageFlags.Dynamic),
	CannonBallSpawn = GetEntity(authoring.CannonBallSpawn, TransformUsageFlags.Dynamic)
	});
	AddComponent<Shooting>(entity);

I am new to this, please correct me if I am wrong