I have connected a device to my Draytek 2866ax and also my Draytek 2766ax.
Both times the connection was 802.11ac (so WiFi 5) but the authentication was SAE and so WPA3.
However, the station shows as Status "A" which is WPA2 but I captured the wireless trafic (with WireShark) and I know it was SAE (WPA3) and so the Status should be "S".

I have a new 2865ax router and see the same issue.
I have my main SSID configured for WPA3 now, but have some devices which couldn't connect. I setup a second SSID using WPA2/PSK for these devices.
Sometime I see devices on the main SSID using WPA3, which incorrectly show a status of "A" when it should be "S".