Nice that you found time to test this and that it was apparently repeatable. I'd noticed it but just figured it was just wg's servers doing strange things.
One i'm curious if anyone else has noticed, but i think there are situations where you kill the commander (maybe within that 1.65s) and then don't get spotted. Guessing i killed the commander at least as i don't have whatever that perk is that tells you. Could explain some. Could also be their commander was already dead and or it's just wg's odd spotting where some feather floating between my spotting points and theirs kept me unspotted.