I feel i have found a new bug in the game.
With the achievement of doing a Solo Greater Rift 70 you are suppose to get a guaranteed Primal Legendary item. When i finally got around to doing my solo Greater Rift i was up to 77 (since i was doing T16 regular rifts) when i completed this rift in the alloted 15 minutes i did not get my Primal Legendary item to drop but i got the achievement for doing the solo rift. So i went back and solo’d the level 70 specifically and still have not received any primals. it has been a couple days now since i did this and i have not seen any sign that my game has in fact unlocked Primal Legendary Items.
The bug being the game has a chance to not drop/unlock primal items if you do a Greater Rift higher than 70 specifically.