Error on ExpectAndReturn when passing table from dataset

I have found a strange one that used to work in 3.7.1, but seems to be broken in 4.0.3. The following code will now fail with the error "Mocked return value of DataTableCollection.get_Item() is unknown, use recorder.Return().":

Public Class TheClass
    Public Function TheMethod(ByVal theDataTable As DataTable) As Integer
        Return theDataTable.Rows.Count
    End Function
End Class

Imports TypeMock
Imports MbUnit.Framework

<TestFixture()> _
Public Class TheTestClass

    <Test()> _
    Public Sub TheTestMethod()
        MockManager.Init()

        Dim ds As New DataSet
        ds.Tables.Add("aTable")
        Dim tc As New TheClass

        Using recorder As New RecordExpectations
            recorder.ExpectAndReturn(tc.TheMethod(ds.Tables(0)), 0)
        End Using

        Dim answer As Integer = tc.TheMethod(ds.Tables(0))

        MockManager.Verify()
    End Sub

End Class

Changing

recorder.ExpectAndReturn(tc.TheMethod(ds.Tables(0)), 0)

To

tc.TheMethod(ds.Tables(0))
recorder.Return(0)

Gives the same error message.

However, this works:

Dim dt As DataTable = ds.Tables(0)
Using recorder As New RecordExpectations
    recorder.ExpectAndReturn(tc.TheMethod(dt), 0)
End Using

Why does this no longer work (or am I doing something wrong (it happens :wink: ))?