Await _parseClient.GetCurrentUser is null after login

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest versions of Parse Server and the Parse .NET SDK.

Issue Description

After login, the current user is null Unity 2020.3.11

Steps to reproduce

    _parseClient = new ParseClient("myAppId", "http://localhost:1337/parse/", "",
        new LateInitializedMutableServiceHub { },
        new MetadataMutator
        {
            EnvironmentData = new EnvironmentData { OSVersion = SystemInfo.operatingSystem, Platform = $"Unity {Application.unityVersion} on {SystemInfo.operatingSystemFamily}", TimeZone = TimeZoneInfo.Local.StandardName },
            HostManifestData = new HostManifestData { Name = Application.productName, Identifier = Application.productName, ShortVersion = Application.version, Version = Application.version }
        },
        new AbsoluteCacheLocationMutator
        {
            CustomAbsoluteCacheFilePath = $"{Application.persistentDataPath.Replace('/', Path.DirectorySeparatorChar)}{Path.DirectorySeparatorChar}Parse.cache"
        }
    );
    Debug.Log($"{Application.persistentDataPath.Replace('/', Path.DirectorySeparatorChar)}{Path.DirectorySeparatorChar}Parse.cache");
    _parseClient.Publicize();

            var loginResult = await _parseClient.UserController.LogInAsync(SystemInfo.deviceUniqueIdentifier, SystemInfo.deviceUniqueIdentifier, new LateInitializedMutableServiceHub { }); //login result not null
            var currenSession = await _parseClient.GetCurrentSessionAsync(); //currentSession == null
            var currentUser = _parseClient.GetCurrentUser();//currentUser == null

Actual Outcome

var currentUser = _parseClient.GetCurrentUser();//currentUser == null

Expected Outcome

var currentUser = _parseClient.GetCurrentUser();//currentUser != null

Environment

Server

• Parse Server version: ^4.5.0
• Operating system: Windows 10
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): Local (http://localhost:1337/parse/)

Database

• System (MongoDB or Postgres): MongoDB
• Database version: N/A
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): remote MongoDB Atlas

Client

• Parse .NET SDK version: v2.0.0-develop-1

Start with the reported ParseClient setup and trace LogInAsync, GetCurrentSessionAsync, and GetCurrentUser in the SDK. Reproduce the Unity 2020.3.11 flow using the listed Parse Server and SDK versions, then add or update a regression test showing that a successful login exposes the current user.