Mocking a DB Connection and Verification: Unexpected Call

I using Iolsator 5.2 to mock a DB call as follows in MSTEST

[TestMethod]
 public void GetToken_ValidDomainUser_ReturnedToken()
 {
SqlConnection fakeConnection = Isolate.Fake.Instance<SqlConnection>(Members.ReturnRecursiveFakes);
            
Isolate.Swap.NextInstance<SqlConnection>().With(fakeConnection);
Isolate.WhenCalled(() => BlackMarble.Sabs.WebService.Utils.ConnectionString).WillReturn("mock_connection_string");

SqlCommand fakeCommand = Isolate.Fake.Instance<SqlCommand>(Members.ReturnRecursiveFakes);
SqlDataReader fakeReader = Isolate.Fake.Instance<SqlDataReader>(Members.ReturnRecursiveFakes);
Isolate.Swap.NextInstance<SqlCommand>().With(fakeCommand);
Isolate.WhenCalled(() => fakeCommand.ExecuteReader()).WillReturn(fakeReader);

Isolate.WhenCalled(() => fakeReader.Read()).WillReturn(true);

Isolate.WhenCalled(() => fakeReader.GetInt32(0)).WillReturn(0);
Isolate.WhenCalled(() => fakeReader.GetInt32(1)).WillReturn(1);
Isolate.WhenCalled(() => fakeReader.GetString(2)).WillReturn("Two");

// run the actual command            
var generator = new BlackMarble.Sabs.TokenGenerator.Generator();
var actual = generator.GetToken();

// check the results
Assert.IsNotNull(actual, "No token returned for user");
Assert.AreEqual(actual.UserID, 0);
Assert.AreEqual(actual.CompanyID, 1);
Assert.AreEqual(actual.DisplayName, "Two");
Assert.AreEqual(actual.IsValid(), true);
}

If it is run with testDriven.NEt it runs fine, but of run via TestDriven.Net and the deugger (i.e. VSHOST is involved) I get a

TypeMock Verification: Method System.Data.SqlClient.SqlConnection.Finalize() was expected but was not called

I tried

Isolate.Verify.NonPublic.WasCalled(fakeConnection ,"Finalize");

But this did not help, I assume I have mde a simple mistake but cannot spot it