How is the 30 min Unlimited Focus (50 consecutive wins reward) supposed to work? It seems like it auto-activated instead of being an item you could use, but it doesn't do anything. I'm looking at the screen right now that shows "Not enough focus!" to do another battle, but underneath that the Boosters tab says "Unlimited Focus for 30m" with a timer ticking down from when I won battle 50.

Is it bugged overall, just for me, or am I missing something?