StackOverflowException on JsonConvert.DeserializeObject

I am writing a solution that contains an ASP.NET Web API (.NET 4.6.2) aka the backend, a Web API Client Implementation PCL aka the middleware and Xamarin.Forms projects aka the frontend. After recent changes to my web api I now always get a StackOverflowException when I try to deserialize the JSON response in my frontend. The specific line is:

result_ = JsonConvert.DeserializeObject<ObservableCollection<Employee>>(Encoding.UTF8.GetString(responseData_, 0, responseData_.Length));

When I am debugging here, I see that the program is jumping between two lines until the overflow occurs:

EmployeesManager.cs (in the middleware)

private Image _image = new Image();

ImagesManager.cs (in the middleware)

private Employee _employee = new Employee();

Here is more code:

The models (in the Web API):

public class Employee
{
    public int Id { get; set; }

    // OMITTED PROPS

    public int? ImageId { get; set; }
    public Image Image { get; set; }

    public ICollection<Device> Devices { get; set; }

    public int? TeamId { get; set; }
    public Team Team { get; set; }
}

public class Image
{
    [Key]
    public int Id { get; set; }

    [Required]
    public byte[] Data { get; set; }

    public int EmployeeId { get; set; }

    public Employee Employee { get; set; }
}

The models in the client implementation (middleware). They are generated with Nswag:

public partial class Employee : INotifyPropertyChanged
{
    private int _id;

    private int? _imageId;
    private Image _image = new Image(); // THIS LINE IS PART OF THE OVERFLOW
    private ObservableCollection<Device> _devices;
    private int? _teamId;
    private Team _team = new Team();

    // OMITTED PROPS

    [JsonProperty("image", Required = Required.Default, NullValueHandling = NullValueHandling.Ignore)]
    public Image Image
    {
        get { return _image; }
        set
        {
            if (_image != value)
            {
                _image = value;
                RaisePropertyChanged();
            }
        }
    }

public partial class Image : INotifyPropertyChanged
{
    private int _id;
    private int _employeeId;
    private Employee _employee = new Employee(); // THIS LINE IS PART OF THE STACK OVERFLOW
    private byte[] _data;

    // OMITTED PROPS 

    [JsonProperty("employee", Required = Required.Default, NullValueHandling = NullValueHandling.Ignore)]
    public Employee Employee
    {
        get { return _employee; }
        set
        {
            if (_employee != value)
            {
                _employee = value;
                RaisePropertyChanged();
            }
        }
    }

I use the Web API client implementation via Xamarin.Forms projects. The behavior is the same on all platforms. Only iOS and UWP recognize the Stack Overflow, though. On Android the app just closes without an Exception when I am reading data from the Web API.

If somebody wants to see more code, I can prepare a small package containing the requested code. Posting them all here would break readability completely.

I use Newtonsoft Json.NET, Entity Framework 6, NSwag 6, Xamarin.Forms v2.3.2.127.