Typemock 5.3.1: Problem when mocking IUnityContainer

public class GenericDefaultValueResolver
{
    public T ReturnsDefault<T>()
    {
        return default(T);
    }
}

[TestClass]
public class GenericDefaultValueResolverTests
{
    [TestMethod]
    public void GenericMethodTest()
    {
        var genericResolver = Isolate.Fake.Instance<GenericDefaultValueResolver>();
        Isolate.WhenCalled(() => genericResolver.ReturnsDefault<string>()).WillReturn("1");
        Isolate.WhenCalled(() => genericResolver.ReturnsDefault<int>()).WillReturn(1);

        var intValue = genericResolver.ReturnsDefault<int>();
        var stringValue = genericResolver.ReturnsDefault<string>();
        
        Assert.AreEqual(1, intValue);
        Assert.AreEqual("1", stringValue);
    }
}