JsonConverter not called on deserialization when set as property attribute

[wadeamaral]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the bug

The Read method in the custom HoursMinutesOnlyJsonConverter is never called during deserialization of a .net core API project. The Request class is being used inside a few Controllers with a [FromBody] tag.

public class Request
{
    [JsonConverter(typeof(HoursMinutesOnlyJsonConverter))]
    public TimeOnly? Time { get; set; }
}

public class Response
{
    [JsonConverter(typeof(HoursMinutesOnlyJsonConverter))]
    public TimeOnly? Time { get; set; }
}

 public class HoursMinutesOnlyJsonConverter : JsonConverter<TimeOnly?>
 {
     public override TimeOnly? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
     {
         // THIS IS NEVER BEING CALLED
         return null;
     }

     public override void Write(Utf8JsonWriter writer, TimeOnly? value, JsonSerializerOptions options)
     {
         // THIS WORKS AS EXPECTED
         if (value == null)
         {
             writer.WriteNullValue();

         }
         else
         {
             writer.WriteStringValue(((TimeOnly)value).ToString("hh:mm"));
         }
     }
 }

Expected Behavior

The custom converter should be called during deserialization.

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

8.0.101

Anything else?

No response

[maets]

Having the same problem. Are there any updates?

[maets]

Solved my own issue by adding the following override to my custom converter: public override bool HandleNull => true;

I guess it's optimized by circumventing the converter if encountering null or something like that