Unity GoogleMobileAds-v5.4.0 發生 "You are trying to create a MonoBehaviour using the 'new' keyword" 錯誤

2021.07.04 GoogleMobileAds.Unity.RewardingAdBaseClient:CreateButtonBehavior() 發生 " You are trying to create a MonoBehaviour using the 'new' keyword.  This is not allowed.  MonoBehaviours can only be added using AddComponent(). Alternatively, your script can inherit from ScriptableObject or no base class at all
UnityEngine.MonoBehaviour:.ctor()
ButtonBehaviour:.ctor() " 錯誤，雖然不會影響結果但是改一改總是好的。

解決方法為將 RewardingAdBaseClient 內的

    buttonBehaviour = new ButtonBehaviour(); 

改為:

     GameObject ob=new GameObject();
     ob.AddComponent<ButtonBehaviour>();
     buttonBehaviour = ob.GetComponent<ButtonBehaviour>();

即可。