Inefficient enumeration Declined - Cannot Reproduce

I've discovered what seems to be a problem when SfGrid enumerates a data source. In our case it is quite costly.

If we provide an IEnumerable<T> data source and in there we pull "chunks" of data at a time and yield the individual items from each chunk. The control seems to begin enumerating several times (pulling the first item) before eventually enumerating the data.

So in our case it causes a chunk of 100 items to be pulled form the server, then enumerates just the first item from that and does that several times. The it enumerates all the data again correctly. The displayed results are fine, the extraneous pulls it does at the beginning do not get displayed so the appearance is not at fault.

Under the hood our data is pulled in chunks until there are no more chunks, here is a simplified representation of this:

    private IEnumerable TestConfigurationItems()

    {

        for (int I=0; I < 10; I++)

        {

            // Do possibly expensive IO here, then enumerate the results

            for (int Y=0; Y < 10; Y++)

            {

                yield return new Definition() { Description = "test", Name = $"{I}.{Y}", Scope = "Test", ConfigId = new Guid() };

            }

        }

    }