newtonsoft JSON serializer unable to deserialize collection with c# property initializer - json.net

Question

Say you had a simple object as follows:
public class PaymentLineItem
{
public DateTime TimeStamp { get; set; }
public decimal Amount { get; set; }
public string Description { get; set; }
public PayCodeDto PayCode { get; set; } //= PayCodeDto.Invalid;
public override string ToString()
{
return StringUtils.ToString(this);
}
public override bool Equals(object obj)
{
return Equals(obj as PaymentLineItem);
}
public override int GetHashCode()
{
unchecked
{
var hashCode = TimeStamp.GetHashCode();
hashCode = (hashCode * 397) ^ Amount.GetHashCode();
hashCode = (hashCode * 397) ^ (Description != null ? Description.GetHashCode() : 0);
hashCode = (hashCode * 397) ^ (PayCode != null ? PayCode.GetHashCode() : 0);
return hashCode;
}
}
public bool Equals(PaymentLineItem other)
{
if (other == null) return false;
if (ReferenceEquals(this, other)) return true;
return TimeStamp.Equals(other.TimeStamp)
&& Amount.Equals(other.Amount)
&& string.Equals(Description, other.Description)
&& Object.Equals(PayCode, other.PayCode);
}
}
There is nothing special with this class apart from usage of the new C# auto-property initialize introduced in C# 6.0. PayCodeDto is simple with three properties and implements IEquatable.
If you create a collection of these payment items and serialize this using
var serialized = JsonConvert.SerializeObject(sut);
and you then take the correctly serialized string and deserialize using
var deserialized = JsonConvert.DeserializeObject<List<PaymentLineItemLight>>(serialized);
what you end up with is a collection all instances of the line items having the same PayCode.
This is the sample test:
[Test]
public void Should_Serialize_Collection_In_Package_Correctly()
{
var sut = new List<PaymentLineItemLight>
{
new PaymentLineItemLight
{
Amount = new decimal(153.0000),
Description = "48385 - Multiple items payment",
TimeStamp = DateTime.Parse("2018-01-30T10:40:47.477"),
PayCode = new PayCodeDto("105", "dont-care") {DictionaryId = 2}
},
new PaymentLineItemLight
{
Amount = new decimal(53.0000),
Description = "483816 - Multiple items payment",
TimeStamp = DateTime.Parse("2018-01-30T10:40:47.477"),
PayCode = new PayCodeDto("104", "dont-care") {DictionaryId = 2}
},
new PaymentLineItemLight
{
Amount = new decimal(200.0000),
Description = "483817 - Multiple items payment",
TimeStamp = DateTime.Parse("2018-01-30T10:40:47.477"),
PayCode = new PayCodeDto("102", "dont-care-102") {DictionaryId = 2}
}
};
var serialized = JsonConvert.SerializeObject(sut);
var deserialized = JsonConvert.DeserializeObject<List<PaymentLineItemLight>>(serialized);
CollectionAssert.AreEqual(sut, deserialized);
}
If I remove the auto-property initialize, the test passes. I must be missing something here. Anyone seen this?