Cannot move between attacks/casts with 0s cooldown skills (animation cancel?)

Bug Reports
1

In previous seasons if we hold both left & right mouse button (0s cooldown skill in right mouse button slot, say, a normal melee attack) at the same time, the character will be able move a bit between melee attacks.
This is like the animation cancel in Dota2.
This is pretty useful for skill avoiding or triggering skills like Devouring Orb (Abyssal Rush node: autocast while moving),

But in this season the character will stand still attacking.
Is this a bug or as it should be?

2

Sometimes I found that I could autocast Devouring Orb even if I stand still attacking (while holding mouse left button). But only happens sometimes

3

There’s another report about this

Looks like post attack animation is fucked. Move and attach at the same time cancels it. Effectively you have 2x attack speed. Broken af and you can’t play without exploiting it because it’s just normal control.