AFN zone ventilation not reported during warmup?

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I've been debugging some AFN models, and I've noticed that the AFN Zone Ventilation Rate isn't reported during warmup, even though its availability is clearly affecting the warmup (as I can see if I change the availability schedule).

I was just wondering if anyone knew if this was intended behaviour? Is there something I'm missing to view it? I've looked through the Input/Output reference but couldn't find anything obvious...