Where I work, custom is to only talk with coworkers and (especially) members of other teams about leaving company on your last day. No one mentioned this earlier, at least not near me, even when this affected my work.
On the other hand, I'm approached with direct questions.
- I don't want to lie.
- I don't want to disturb anyone's workflow
- I don't want to fight this custom
They can't really fire me, not now, not for something that minor, but I'd rather avoid fight with management, leaving bad impression. And I'd rather avoid lies. Being evasive is interpreted (correctly) as confirmation, so I feel I'm out of options.