When running wlan.scan on a Pico_w (MicroPython v1.19.1-966-g05bb26010 on 2023-03-13; Raspberry Pi Pico W with RP2040, also on earlier nightly builds), the output is disconnect from the documentation. Examples:

1. "security": value 5 is returned (whereas doc offers only values 0..4);
2. "hidden": values 2, 3 sometimes 5 is returned - on a non_hidden network - whereas doc offers only value 0,1;

script used:
import network
station = network.WLAN(network.STA_IF)
station.active(True)
active_ssid = station.scan()
for item in enumerate(active_ssid):
print(item)
station.disconnect()