Still not fixed, sadly.
It definitely is better than before, but it still doesn't proc on kill, or at least is fairly unreliable, and the UI shows a maximum amount of stacks of 99 (I haven't been able to test, yet, if it's just a UI issue or if it effectively stops stacking at 99).
Edit: I further tested it, it only happens if you have more than one shard (2 normal=caps at 99, 3 Tau=caps at 224). Was kinda hard to test, but I believe it should be the UI only, it seems to apply the maximum amount of stacks if you reach the cap.