Missing mp_first_event_time in Engage API JSON Output?

Hi everyone I'm using the engage api to export profiles data, but I noticed that the mp_first_event_time column isn't being returned in the JSON output. Does anyone know if this is a limitation of the api? When using a manual export in Mixpanel UI I can see this column and looks good, but using engage api it isn't present. PS: Even when I'm not defining "output_properties" parameter the column not appear in the json output https://developer.mixpanel.com/reference/engage-query