Doing Big Enchilada, down to one goon (low health) in wave 2. I had a Recovery countdown on the board, and my best move was to create a match-5. The damage from the match was enough to kill the goon. The resulting critical tile landed on the Recovery tile and matched it away against the already-dead goon.
The wave rolled over, but at no point did the Recovery tile’s match effect kick in. Even though the damage would have gone to waste, I didn’t get any of the board shake that comes with it. No activation banner, nothing.