Cosmic key doesn't drop on BNW dungeon

Anybody got a cosmic key on BNW dungeon since the last update?
If not: BUG
If yes: decreased droprate without communicating

As far as I know they drop from BNW, not LoL.

Sry for the mistake. I mean BNW!

I finally got 1 key in over 40 runs!

It's just bad luck. I just ran it and got 3 keys from a single refill. We are all frustrated about the bugs but you don't need to be searching for them everywhere.