Snipe helmet Assailum targeting bug

Using Snipe with Puncture. Look at where I keep my cursor for the entire channel. Enemy isn't moving. Look at where the arrow flies - like 100px away from my cursor and misses the enemy, no dmg dealt. Is it bugged or am I misunderstanding how to aim?

Can't quite see it on the screenshot fragment, but YES, enemy's healthbar is visible throughout the entire channeling, release and after I fire. 100% I moused over him.

https://pasteboard.co/n1LQ6fBioYaZ.png

Not just visual bug, he actually takes no dmg and doesn't bleed.

Other people say its bugged too, I'm not actually doing it wrong. They suggested reporting it so here I am.