I would say Graveyard vs Incarnate? i think it was.. It does the same thing as the voodoo ability. If your field is full and they have graveyard out it wont summon a skeleton even though space is there because it is going off of your field instead.
i dont really understand what hes saying but i played incarnate today using a variant of CCYB and out of 4 creatures infected (fractalled his bloodsucker, infected the original bloodsucker the turn after and 3 vampys), only 1 produce skellys (the first time it triggered, off a dying bloodsucker)
i did the same a few turns after that and his graveyards still only triggered from the first dying creature
and i only have 7 creature slots filled, not a full field
i knw there was some issues regarding boneyard/graveyard right after 1.252 was released but from my understanding zanz already fix that. this might be incarnate related case but the funny thing is, this is the first time something like this happened to me