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I may be wrong, but I seem to remember that in 2016 it was said to be allowed in the briefing, but a bit of a cunt thing to do to leave the bags down when climbing to Giau. As there was that race within a race to be the fastest on the parcours climbs. Don't know if anyone did it. Then in 2017 I remember it was definitely forbidden and I think at least on rider got a penalty for that.
And whether something is in the rules or not, the racers are the ones who shape the culture. So I think we should be very clear on not trying to find tricks/loopholes.
EDit: Meant to write Giau but wrote Grappa for some reason.
I haven't looked up the results but do you mean this?