I'm currently trying to do the weekly challenge of knocking out opponents with the lollipop 5 times and it refuses to award me credit beyond 3/5 despite the multitude of players I've knocked out (even to the point of them crumbling into dust). I've spent hours in quick match games and many of those games I've gotten at least 1 or 2 and yet I'm still stuck at 3/5. All the other challenges completed without issue except for this one.