This bug appeared after the last 2 patches!
Very rarely it works correctly - if you are using Aberration first of using main attacks.
But if you are using main attacks first, the attack speed increase (+40%) occurs after 3-4 seconds after using Aberration and ends 3-4 later after its duration is over.
Playing from pc Win7, game version 2.2.5.1891845.1893121.1946568.E.333.D.Windows
The problem was fixed! 
Thank you! Close this now.