This time (25/02) and the previous MWM (18/02) when I got my 3rd win the server produced no reward upon completing its "Waiting..." procedure. It happened to me before with some of the previous sets and also after the alchemy set release, iirc. I suspect that it tries to reward me with an alchemy card style and I already own most of them (well, for A-ELC and A-EOE I own all of them) so it naturally gives me nothing. I believe it is a bug as it should pull from a larger pool of styles than the last alchemy set.