runtime: IOptionsSnapshot is not getting the updated values from app settings

I am using .net core 3.1

I am trying the IOptionsSnapshot with strongly typed settings. I am injecting it in a controller as below

1. The program class looks like below

public static void Main(string[] args)
       {
           Directory.SetCurrentDirectory(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));

           BuildWebHost(args).Run();
       }

       public static IWebHost BuildWebHost(string[] args) =>
           WebHost.CreateDefaultBuilder(args)
           .ConfigureAppConfiguration((ctx, config) =>
           {
               config.SetBasePath(Directory.GetCurrentDirectory())
               .AddJsonFile("Config/appsettings.json", optional: false)
               .AddJsonFile($"Config/appsettings.{ctx.HostingEnvironment.EnvironmentName}.json", optional: true);

           })
           .UseStartup<Startup>()
           .Build();

1. the appettings is configured in startup as below :

services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));

1. the controller look like below, injected the IOptionSnapshot in constructor :

 private AppSettings _appKeys;

        public WeatherForecastController(ILogger<WeatherForecastController> logger, IOptionsSnapshot<AppSettings> appSettings)
        {
            _logger = logger;
            _appKeys = appSettings.Value;

        }

1. I am using it a method like below for testing , but the output is always the same even after editing the values after running the application

        [HttpGet("GetConfigs")]
        public List<string> GetConfigs()
        {
            List<string> configs = new List<string>();

            configs.Add(_appKeys.Config1);

            configs.Add(_appKeys.Sql.ConnectionString);

            return configs;
        }

is there anything am missing , or is this a bug ?