[eluser]OverZealous[/eluser]
[quote author="PoetaWD" date="1252440349"]I think this is a BUG... because it works perfectly in the non-deep relationships.[/quote]
Yup, it's a bug. Thanks for finding it. I was looking up the field names too early.
Sorry about that, I'll get it fixed for the next release. I also added a check in to make sure it didn't throw a DB error. Now it logs a debug-level message. (I figure it might make sense to have the ability to dynamically pick which columns to include, optionally including none.)