Почему сборщик не собирает объект файлового потока

var cts = new CancellationTokenSource();
Task.Run(() => {
    while (!cts.IsCancellationRequested)
    {
        try
        {
            var path = "Temp.dat";
            var bytesToWrite = new byte[] { 1, 2, 3, 4, 5, 6 };
            var fs = new FileStream(path, FileMode.Create);
            fs.Write(bytesToWrite, 0, bytesToWrite.Length);
            GC.Collect();
            File.Delete(path);
            Console.WriteLine("success");
        }
        catch (IOException)
        {
            Console.WriteLine("IOException");
        }
        Thread.Sleep(1000);
    }
});
Console.ReadLine();
cts.Cancel();
Console.ReadLine();

            // var fs = new FileStream(path, FileMode.Create);
            // fs.Write(bytesToWrite, 0, bytesToWrite.Length);
            new FileStream(path, FileMode.Create).Write(bytesToWrite, 0, bytesToWrite.Length);

[System.Security.SecuritySafeCritical]  // auto-generated
        ~FileStream()
        {
            if (_handle != null) {
                BCLDebug.Correctness(_handle.IsClosed, "You didn't close a FileStream & it got finalized.  Name: \""+_fileName+"\"");
                Dispose(false);
            }
        }

class Neko : FileStream, IDisposable
{
    ~Neko()
    {
        Console.WriteLine("Die");
    }
 
    public Neko()
        : base(@"D:\temp\123.txt", FileMode.OpenOrCreate)
    { }
}

var fs = new FileStream(path, FileMode.Create);
fs.Write(bytesToWrite, 0, bytesToWrite.Length);
fs = null;
GC.Collect();

var neko = new Neko();
neko = null;
Console.WriteLine($"{GC.GetTotalAllocatedBytes(true)}");
GC.Collect();
Console.WriteLine($"{Neko.Flag}");
Console.WriteLine($"{GC.GetTotalAllocatedBytes(true)}");
 
class Neko
{
    public static int Flag = 0;
 
    private int[] buff = new int[1024];
 
    ~Neko() => Interlocked.Increment(ref Flag);
}