Csharp System.Text.Json数据化的C#类映射

我正在编写C#来与第三方API接口.我在将一个特定的响应映射到一个类时遇到了问题.

该方法的doco说，响应将是:

{
    <text>:[{   /* driver ID */
        "t":<uint>, /* time of binding/unbinding*/
        "u":<long>  /* unit ID if binding, 0 if unbinding */
    }],
    ...
}

回答的例子是:{"2534":[{"t":1711353044,"u":10568}]}. 我定义了响应类和子类:

public class GetDriverBindingsResponse : IWialonApiRequestObject
{
    /// <summary>
    /// Collection of bindings.  The key is a Driver Id
    /// </summary>
    [JsonPropertyName("")]
    public Dictionary<string, List<DriverUnitBinding>>? Bindings { get; set; }
}

public class DriverUnitBinding
{
    /// <summary>
    /// time of binding/unbinding
    /// </summary>
    [JsonPropertyName("t")]
    public uint Time { get; set; }

    /// <summary>
    /// unit ID if binding, 0 if unbinding
    /// </summary>
    [JsonPropertyName("u")]
    public long UnitId { get; set; }
}

但是，在进行重命名时，绑定集合为null.即使是简单的测试也会失败:

string test = "{\"2534\":[{\"t\":1711353044,\"u\":10568}]}";
GetDriverBindingsResponse? x = JsonSerializer.Deserialize<GetDriverBindingsResponse>(test);
Console.WriteLine(x.Bindings?.Count);

我需要更改什么才能正确地反序列化这个类？