使用Unity Ads的GoogleMobileAds - 基于奖励的视频广告事件处理程序问题

Question

我有一个游戏项目，它使用带有Unity Ads的GoogleMobileAds来提供横幅广告，插页式广告和奖励视频广告（统一广告作为中介网络）。一切都设置正确（admob配置，sdk和适配器文件等），似乎工作正常。所有三种类型的广告都在加载和显示，没有错误。
但是有一个小问题。我很难及时回复基于奖励的视频广告 OnAdRewarded 活动。我尝试了几个选项，包括在事件处理程序中运行奖励命令（不工作）和使用标志并检查其值（不工作）。据我所知，googlemobileads事件没有在主线程中提升。旗帜应该可以做到这一点，但事实并非如此。是否有人遇到过这个问题并找到了解决方案？

我的代码如下：

using GoogleMobileAds.Api;
using System;
using System.Collections;
using UnityEngine;

public class RewardBasedAdManager : MonoBehaviour
{
    private RewardBasedVideoAd rewardBasedVideoAd;

    public int rewardAmount = 25;
    public bool isPlayerRewarded = false;

    private void Start()
    {
        // Get singleton reward based video ad reference.
        rewardBasedVideoAd = RewardBasedVideoAd.Instance;

        // RewardBasedVideoAd is a singleton, so handlers should only be registered once.
        ..
        rewardBasedVideoAd.OnAdRewarded += this.HandleRewardBasedVideoRewarded;
        ..
        RequestRewardBasedVideo();
    }

    public void RequestRewardBasedVideo(){...}

    ...

    private void HandleRewardBasedVideoRewarded(object sender, Reward args)
    {
        //Debug.Log("HandleRewardBasedVideoRewarded event received.");
        string type = args.Type;
        double amount = args.Amount;
        //Debug.Log("User rewarded with: " + amount.ToString() + " " + type);

        // Option 1
        // Directly execute reward command (not working)
        // It's a singleton. Could this be the problem?
        CoinTracker.Instance.CoinCount += rewardAmount;

        // Option 2
        // Use flag and check it's value in Update method (not working either)
        isPlayerRewarded = true;
    }

    private void Update()
    {
        if (isPlayerRewarded)
        {
            CoinTracker.Instance.CoinCount += rewardAmount;
            isPlayerRewarded = false;
        }
    }
}