Evaluations, Stored Completions, and sample.output_text?

Has something changed recently with the way Evaluations work in the Dashboard?

Two weeks ago, when I ran them I had two choices for evaluation: item.input and item.output. Now, when I try to set a new Evaluation up, and I import from Stored Completions I get two columns input and output as I did before, but in the dropdowns for the possible tests I get this:

I tried running it with sample.output_text but got:

Which makes sense…but where is item.output?

UPDATE: on further investigation, I now see there is a pop-up hover that explains:

I tried copying the failed Evaluation and running it again, and now it’s working…

Second one running freshly Created seems to be working now as well.