I've run into this issue a couple times today. I'll be killing enemies for a long amount of time (on patrol) and I won't get any ammo drops, no engrams and no orbs of light when I use my super. It's happened twice today and I know I can't be the only one. Something to fix in your next patch, Bungie.
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I had this yesterday while on patrol on cosmodrome. No ammo drops at all in the first area. But once I got to the divide they started dropping again.
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You don't get orbs for your own super.