Topic about covers it. Every time I equip this weapon and try to use Void Cleave I do not teleport/move and get bugged out for 2-3 secs (unable to do anything).
I am sure this is not intended, and this weapon is quite nice, so I would very much like to use it.
As soon as I switched back to Dreamthorn the problem went away. I have 2 Shadow Beacons, both do it. Something is very broken with that weapon ATM.