It's been the same for over a year, not a client issue. When creeps are moving thei hitbox is inaccurate. This same bug makes it really hard to shoot ziplining creeps on low fire rate heroes . Also when creeps are dropping. The faster the movement, the more inaccurate the hitbox is. Heres...
Paradox carbine sometimes doesn't do damage whilst mystic shot does in the same shot. Might be caused by echo shard interaction, replicated it once in sandbox.
EDIT: If you start charging carbine after shooting while the projectile has not yet hit it does no damage so this is possible to do in...
If you go frame by frame you can see that the cloak is going where you first press the ability. However there is the 0,2- 0,3 sec delay before the cloak actually launches and previously you could use this time to adjust the aim and now you can't anymore.