JsonSerializer.Deserialize<T> throws NullReferenceException. JsonSerializer.Deserialize and JsonConvert.DeserializeObject works well

[felipepessoto]

If JSON has a comment before a complex object, JsonSerializer throws a NullReferenceException

Expected behavior

No Exceptions or ArgumentException

Actual behavior

System.NullReferenceException: Object reference not set to an instance of an object.
   at Newtonsoft.Json.Linq.JTokenWriter.RemoveParent()
   at Newtonsoft.Json.Linq.JTokenWriter.WriteEnd(JsonToken token)
   at Newtonsoft.Json.JsonWriter.AutoCompleteClose(JsonContainerType type)
   at Newtonsoft.Json.JsonWriter.WriteEndObject()
   at Newtonsoft.Json.JsonWriter.WriteEnd(JsonContainerType type)
   at Newtonsoft.Json.JsonWriter.WriteEnd()
   at Newtonsoft.Json.JsonWriter.AutoCompleteAll()
   at Newtonsoft.Json.Linq.JTokenWriter.Close()
   at Newtonsoft.Json.JsonWriter.Dispose(Boolean disposing)
   at Newtonsoft.Json.JsonWriter.System.IDisposable.Dispose()
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateJToken(JsonReader reader, JsonContract contract)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize[T](JsonReader reader)
   at TestJsonDeserialization.Program.Main(String[] args)

Steps to reproduce

string jsontext = @"{ ""ABC"": //DEF
{}}"; //NullReferenceException
//jsontext = "{ \"ABC\": /*DEF*/ {}}";  //NullReferenceException
//jsontext = "{ \"ABC\": /*DEF*/ 1}";//ArgumentException

using (var stringReader = new StringReader(jsontext))
using (var jsonReader = new JsonTextReader(stringReader))
{
    JsonSerializer serializer = JsonSerializer.Create();
    var x = serializer.Deserialize<JToken>(jsonReader);
}

JsonSerializer.Deserialize() and JsonConvert.DeserializeObject works fine.

Is it safe to replace

serializer.Deserialize<JToken>(jsonReader)

by

(JToken)serializer.Deserialize(jsonReader)

?

The behavior is exactly the same?

Thanks