That's what I heard from my LS mate, is that as long as that occurs from a party member (in my case 250 points of water damage) that it'll count for your trial. I've never personally experienced it, but as far as I know, it would be a yes.
I dont think that was an actual change....wasn't it always like that? Either way I can 100% confirm yes that it does still proc your credits. I was duoing some bees for ice with a blm at the hives in Wajaom and he was on -ga3 duty while I on sch, was on sleep-ga/heal/gravi-ga/bind-ga duty.