Environment ESP32-WROOM-32UE.
I need to run WiFi.scanNetworks() asynchronously for my project. My sample code returns a list of discovered networks however the output during WiFi.scanComplete() does not make sense. Snippet from test code:

void _scan_check() {
   int asyncscan = WiFi.scanNetworks(true);
   delay(1000);
   int status = WiFi.scanComplete();
   while(status < 0) {
    Serial.printf("Status = %d", status);
    delay(1000);
    status = WiFi.scanComplete();
   }
   Serial.printf("Status = %d", status);
}

When run I get the following output (commented):

Status = -1  //equal to WIFI_SCAN_RUNNING
Status = -1  //equal to WIFI_SCAN_RUNNING
Status = -1  //equal to WIFI_SCAN_RUNNING
Status = -1  //equal to WIFI_SCAN_RUNNING
Status = -2  //equal to WIFI_SCAN_FAILED
Status = -2  //equal to WIFI_SCAN_FAILED
Status = 7   // discovered 7 networks

This happens regardless of how many networks discovered. So my question is, why do I always get one or more WIFI_SCAN_FAILED prior to getting the actual count of discovered networks?
Is this an undocumented way it works or is there some bug with the ESP32 backend code?