ReadFromJsonAsync返回具有空值的对象属性

using System;
using System.Net.Http;
using System.Text.Json;
using System.Threading.Tasks;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Program
{
    public static async Task Main()
    {
        var json = "{\"Name\": null, \"Age\": 25}";

        var options = new JsonSerializerOptions
        {
            PropertyNameCaseInsensitive = true
        };

        var person = await JsonSerializer.DeserializeAsync<Person>(
            new MemoryStream(Encoding.UTF8.GetBytes(json)), options);

        Console.WriteLine($"Name: {person.Name}");
        Console.WriteLine($"Age: {person.Age}");
    }
}