It makes sense that certain aoe spells were bugged at one point and not casting correctly. If you're looking for proof I suggest finding posts about the gem icon color. Blue means unlimited and green means max 4, right? Surely there are posts complaining that these colors are meaningless if there was a 4 mob limit.
Most likely it was a single patch that broke certain spells or z-axis casting made aoes not work right or some other little oddity that the devs noticed and fixed.
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