GMA 8.7.0 - RewardedAd Show event - callback not working on device

[juaxma]

[REQUIRED] Step 1: Describe your environment

• Unity version: 2022.3.13f
• Google Mobile Ads Unity plugin version: 8.7.0
• Platform: iOS
• Platform OS version: iOS 17.2.1
• Any specific devices issue occurs on: No
• Mediation ad networks used, and their versions: No

[REQUIRED] Step 2: Describe the problem

var adUnitId = "ca-app-pub-3940256099942544/5224354917"; // Test RewardedAd ID

public void ShowRewardedAd() 
{
    if (_rewardedAd != null && _rewardedAd.CanShowAd())
    {
        _rewardedAd.Show((Reward reward) =>
        {
            Debug.Log("Reward user");
            OnVideoRewardedFinish?.Invoke(true);
        });
    }
}

The ad appears but the "Show" callback does not fire when the ad is closed. It works as expected on Unity Editor, ad appears and the callback is fired.