Reward Ad Loading Fails After Upgrading from 3.9.2 to 4.1.2

[MasatomoFukuda]

MAX Plugin Version

4.1.2

Flutter Version

3.24.3

Device/Platform Info

iOS 17.6.1 and 18.2

Current Behavior

After upgrading the SDK version from 3.9.2 to 4.1.2, the loading of rewarded video ads fails under specific conditions.
This issue does not occur in versions 3.10.1 or earlier.

Expected Behavior

1. Launch the app.
2. Play a rewarded ad and terminate the app midway (task kill).
3. Restart the app and press the rewarded ad load button.
4. The ad plays successfully.

How to Reproduce

1. Launch the app.
2. Play a rewarded ad and terminate the app midway (task kill).
3. Restart the app and press the rewarded ad load button.
4. The ad fails to load (retrying does not resolve the issue).

Reproducible in the demo app?

Yes

Additional Info

I tried to check the error code, but I couldn't confirm it because the onAdLoadFailedCallback was not triggered.

/// Rewarded Ad Listeners
AppLovinMAX.setRewardedAdListener(
  RewardedAdListener(
    onAdLoadedCallback: (ad) {
      _adLoadState = AdLoadState.loaded;

      _logStatus('Rewarded ad loaded from ${ad.networkName}');

      _rewardedAdRetryAttempt = 0;

      _eventController.state = const RewardedAdEvent.onAdLoadedCallback();
      notifyListeners();
    },
    onAdLoadFailedCallback: (adUnitId, error) {
      _adLoadState = AdLoadState.notLoaded;

      _rewardedAdRetryAttempt = _rewardedAdRetryAttempt + 1;

      var retryDelay = pow(2, min(6, _rewardedAdRetryAttempt)).toInt();
      _logStatus(
        '''Rewarded ad failed to load with code ${error.code} - retrying in ${retryDelay}s''',
      );

      // force crash <- not called when load failed
      FirebaseCrashlytics.instance.crash();

      Future.delayed(Duration(milliseconds: retryDelay * 1000), () {
        AppLovinMAX.loadRewardedAd(_unitId);
      });
      _eventController.state =
          const RewardedAdEvent.onAdLoadFailedCallback();
      notifyListeners();
    },
...