Sylveon ex Magical Charm bugged

so ive noticed sylveon ex magical charm is bugged and isnt applying the effect of 100 less damage on my oppenets next turn i actulally notice this because of a game i lost that i shouldnt have they had that was just put in the active from the bench pikachu ex i just use magical charm on their iron hands ex during my turn and i was full HP during their turn and i took a topaz bolt knocking me out but i should have lived because of the damage reduction leaving me at 70hp no?