The actors are the last thing needed on a film set - and the shortest thing to wait for. Compared to the wait for the lights, camera and sound test, and for costume and make-up, why weould it matter if they nip off for five minutes for a wee?
And in most cases it doesn't even have to affect continuity - they are drinking from opaque vessels (mugs, cups etc).
It's just slack. And the actors think they are good enough to compensate for it. Oh no you're not, chummy, I can see you!
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