Bug in 5.2.2

If think I found a bug in 5.2.2
In other words, one test that was working in 5.2.1, failed with 5.2.2
I checked this by reverting to 5.2.1
I created this class (for a demo to some folks)

public class HttpContext
{
   public static HttpContext Current
   {
      get { throw new NotImplementedException(); }
   }

   public IDictionary<string, string> Items { get; set; }
}

Then I Isolated it out by this

Isolate.Fake.StaticMethods<HttpContext>(Members.ReturnRecursiveFakes);
Isolate.WhenCalled(() => HttpContext.Current.Items["CustomerId"]).WillReturn("10");

I then accessed it from code using this

int customerId = HttpContext.Current.Items["CustomerId"].ToInt32();

Where ToInt32() is an extremely simple extension method
At last I was verifying the call with this:

Isolate.Verify.WasCalledWithExactArguments(() => HttpContext.Current.Items["CustomerId"]);

And that last verify failed with Isolator 5.2.2, but it works in 5.2.1.