i've had that happen, but i've also had it not happen since then. with the diad5, the critical action wasn't when you scanned it but when you big arrow downed after scanning. if you scanned it at 10:30:57 and then big arrow downed at 10:31:00 then it would be late. if you big arrow downed at 10:30:59 it'd be on time. i think there's something similar going on with the diad6 but there's no big arrow down and i can't figure out what it is.
and what other people are saying, if it's late it's late. don't do any shenanigans to avoid getting chewed out, you're just opening yourself to getting fired for cause if you do. always remember: if they're chewing you out, it's because they don't have any ammo.