This is the 5th time I've experienced this bug. It does not grant the XP bonus or the daily random item bonus from battlegrounds(a total of 4 random BG in 3 of which I was in the 1st team and 1 in the 2nd, the 5th was a random normal dungeon). I do not receive anything but the regular XP and rewards from doing these. I submitted a ticket and am still waiting for something. It does NOT happen with all my toons though, I get my rewards as usual with some. Hope it just gets fixed next week's patch.