This Isolate.Invoke.Event call does not invoke an event

[TestClass, Isolated]
public class Tests
{
  class A
  {
     public event Action<int> IntEvent;

     public A()
     {
        IntEvent += (int i) => 
        {
           throw new Exception();            
        };
     }
  }

  [TestMethod]
  public void Test()
  {
     A a = new A();
     Isolate.Invoke.Event(() => a.IntEvent += null, 0);
  }
}