WebApi result lost decimal property's precision?

[Rorschach331]

use the simple web api template:

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.MapGet("/weatherforecast", () =>
    {
        var forecast = new WeatherForecast
        (
            19493.7797202797203M
        );
        return forecast;
    })
    .WithName("GetWeatherForecast")
    .WithOpenApi();

app.Run();
record WeatherForecast(decimal Amount)
{
   
}

when i call the api in the swagger,i get a json like this:

{
  "amount": 19493.77972027972
}

the amount value is 19493.77972027972,but i want the value 19493.7797202797203,what should i do?