I know that Z-axis can cause an issue with fears. When i'm floating and a mob attacks me, even though it doesn't show that it's moved up in Z-axis, it has, and the change in height makes the mob immune to fear. I generally have to wait a couple of seconds and cast it again for it to stick.
The only other issue i've seen with fear is that when a mob makes a sharp 180degree turn will attack a pet or player within range only for the first swing, then continue on it's feared way.
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