Transmuted Kzarka fireball rain bug

Bug Name:

Transmuted Kzarka fireball rain bug​

Bug Description:

As title says, the summoned Kzarka for the "Kzarka: Barrier of Infestation" quest is currently bugged. When he does his red fireball rain attack it should fall spreaded around the room for some time.

Instead, the attack just concentrates in a small area around Kzarka itself, and all the fireballs fall at once, oneshotting the character if it gets caught by the attack.

I know it's supposed to be a party boss, but it is definitely possible to solo it with enough gear, however this bug makes it painfully difficult for any melee character to kill, even while in party.​

How to reproduce/proof:

Summoning and fighting Transmuted Kzarka will eventually lead to the fireball rain bug. In the following link you can see someone soloing the boss with the NOT bugged attack: ​