DataSource.ReadNetworkOnly not working - Able to read/write when offline

[andrelevi]

I'm seeing the same issue as https://github.com/playgameservices/play-games-plugin-for-unity/issues/1254, with Unity 2018.1.1.f1 and v0.9.50.

I was using DataSource.ReadCacheOrNetwork for most of development, but recently switched to DataSource.ReadNetworkOnly. Opening saved games when offline still results in a SavedGameRequestStatus.Success event, unless the user is not authenticated. I've tested on a Google Pixel and Samsung S8 while in airplane mode. I've also deleted the existing cloud save data since switching to DataSource.ReadNetworkOnly, to ensure that there wasn't some sort of flag being stored in the saved data itself.

My test code looks like this:

PlayGamesPlatform.Instance.SavedGame.OpenWithAutomaticConflictResolution(
    SaveFileData.SaveFileName,
    DataSource.ReadNetworkOnly,
    ConflictResolutionStrategy.UseLongestPlaytime,
    OnSavedGameOpened
);

private void OnSavedGameOpened(SavedGameRequestStatus status, ISavedGameMetadata game)
{
    if (status != SavedGameRequestStatus.Success)
    {
      Debug.LogError($"{nameof(OnSavedGameOpened)} {status}");
      return;
    }

    Debug.Log($"{nameof(OnSavedGameOpened)} {status}");
}

[Athomield]

Yep, I have experienced this too.