zone user design airflow rate not used in system sizing

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For a single zone with a unitarysystem HVAC object, I'm using the sizing:zone object with cooling method set to DesigndayWithLimit. It results in the reported cooling user design air flow at the terminal and in the zone sensible cooling user design air flow being set to the limit value. The problem I'm having is that this value is ignored at the system level. What am I missing?