As Last Item in Jubliant Engrams, i had the Mayfly left to drop.
Instead of the Mayfly dropping, i got a Ghost i previously aquired.
See Video for proof.
As I wanted to complete my collection, i bought the Mayfly with 2000 Bright Dust.
I'd like to get that 2000 Dust back.
-
The Knock-out System not working is already a known issue. Bungie will inform the affected people after the Update that will come tomorrow.