✅ JSON serializing Optional type throws an exception(?)

public class OptionalJsonConverter : JsonConverter<IOptional>
{
    public override void WriteJson(JsonWriter writer, IOptional? value, JsonSerializer serializer)
    {
        if (value is not { HasValue: true })
            return;
        
        var optionalValue = value.Value;
        if (optionalValue is null)
        {
            writer.WriteNull();
        }
        else
        {
            serializer.Serialize(writer, optionalValue);
        }
    }

    public override IOptional ReadJson(JsonReader reader, Type objectType, IOptional? existingValue, bool hasExistingValue, JsonSerializer serializer)
    {
        // This calls a default constructor for an Optional<T> type.
        return (IOptional) objectType.GetConstructors()[0].Invoke(new[] { serializer.Deserialize(reader, objectType.GenericTypeArguments[0]) });
    }
}

2023-06-16T08:24:08.897 Info Started serializing Rivoltante.Rest.CreateMessageApiModel. Path ''.
2023-06-16T08:24:08.926 Info Started serializing Rivoltante.Core.Optional`1[System.String] with converter Rivoltante.Rest.OptionalJsonConverter. Path 'content'.
2023-06-16T08:24:08.931 Info Finished serializing Rivoltante.Core.Optional`1[System.String] with converter Rivoltante.Rest.OptionalJsonConverter. Path 'content'.
2023-06-16T08:24:08.932 Info Started serializing Rivoltante.Core.Optional`1[System.String[]] with converter Rivoltante.Rest.OptionalJsonConverter. Path 'attachments'.
2023-06-16T08:24:08.932 Info Finished serializing Rivoltante.Core.Optional`1[System.String[]] with converter Rivoltante.Rest.OptionalJsonConverter. Path 'attachments'.
2023-06-16T08:24:08.933 Error Error serializing Rivoltante.Rest.CreateMessageApiModel. Token PropertyName in state Property would result in an invalid JSON object. Path ''.