Не выполняется finally в try-finally

try
{
    int a = 10;
    int b = 0;
    int c = a / b;
}
finally
{
    Console.WriteLine("Finally");
}

try
{
  try
  {
      int a = 10;
      int b = 0;
      int c = a / b;
  }
  finally
  {
      Console.WriteLine("Finally");
  }
}
catch
{}

Task.Run(() =>
{
    using var a = new A();
    a.Foo();
});
Console.WriteLine("Press enter to exit");
Console.ReadLine();
 
 
class A : IDisposable
{
    public bool Disposed { get; private set; }
 
    public void Dispose()
    {
        Disposed = true;
        Console.WriteLine("I have been disposed");
    }
 
    public void Foo()
    {
        throw new Exception("Unexpected!");
        Console.WriteLine("Foo!");
    }
}

var t = new Thread(_ =>
{
    using var a = new A();
    a.Foo();
}) { IsBackground = true };
Console.WriteLine("Press enter to exit");
t.Start();
Console.ReadLine();
 
 
class A : IDisposable
{
    public bool Disposed { get; private set; }
 
    public void Dispose()
    {
        Disposed = true;
        Console.WriteLine("I have been disposed");
    }
 
    public void Foo()
    {
        throw new Exception("Unexpected!");
        Console.WriteLine("Foo!");
    }
}