.Net Aspire 9.1 - Service Discovery does not find Postgres server

Question

These are my codes in AppHost

var postgres = builder
    .AddPostgres("Postgres", port: 5432)
    .WithImageTag("latest")
    .WithContainerName("MyDatabase-PostgresDb-Aspire")
    .WithEnvironment("POSTGRES_USER", "postgres")
    .WithEnvironment("POSTGRES_PASSWORD", "postgrespassword")
    .WithEnvironment("POSTGRES_DB", "MyDatabase")
    .WithEnvironment("POSTGRES_HOST_AUTH_METHOD", "trust")
    .WithDataBindMount(source: "F:\\DockerVolumes\\Postgres\\Data", isReadOnly: false)
    .WithLifetime(ContainerLifetime.Persistent)
    .AddDatabase("MyDatabase");


var web = builder.AddProject<ArshidWeb>(nameof(ArshidWeb))
    .WithExternalHttpEndpoints()
    .WithScalar().WithSwagger().WithOpenApi()
    .WaitFor(postgres)
    .WithReference(postgres)
    ;

And This is my ConnectionString

"ConnectionStrings": {
    "PostgresConnection":"Host=Postgres;Port=5432;Database=MyDatabase;Username=postgres;Password=postgrespassword;"
}

It works with docker-compose.yml and dockerfile well
But with Aspire seems service discovery won't find Postgres server and throws this error :

System.Net.Sockets.SocketException: 'No such host is known.'

Where did I had mistake ?