The fact that the vent is open and the zone system is in operation doesn't mean that the electrically operated damper is open. Some could be closed at any point in time, such as when the target temperature is reached, and if too many are closed, it's gonna dump excess air flow into the basement to insure the minimally required mass airflow rate.
source https://www.inspectorsjournal.com/topic/18944-air-temp-in-crawl-space-seems-way-to-cold-in-the-summer-and-way-too-hot-in-the-winter/?do=findComment&comment=172902
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