I acquired the Drain, Irrigation, and Conduit keys while playing the Leviathan raid in Destiny 2 today. At some point after receiving the third key (Conduit), I noticed that I no longer had the Drain or Irrigation keys in my inventory.
The item drops popped up on my screen when I received them, my inventory was not full (9/50), they did not go to the postmaster or vault, and I did not dismantle them.
Another member of my raid group also experienced the same issue during our raid; the remaining 4 did not, and have all 3 of their keys.
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I started the raid Wednesday with members from my clan we beat the dogs that night I didn't receive a key or anything from the chest (1st time I beat this section). We finished the gauntlet last night I received the key and chest this time. After completing the pools I got the key but still no drops in the chest. Only 1 member of my fireteam got a key from the dogs, 3 other members of the fireteam also received no drops after completing sections of the raid. Bungie I don't expect you to make it right because many other people are also experiencing this problem, but please fix this problem to make it right. Thank you for your time and have a great day.