Monster with "Amanamu's Void" modifier when killed in the cloud

Please, fix this as fast as possible. I dont know why it works this way when in 0.3 it worked fine.
When you kill a monster with "Amanamu's Void" modifier inside the cloud he drops almost every time "Omen of Liege". You have to make him to move outside of it to actually get better omens or drop in total. But even if you do somehow lead him out if you wont kill him fast enough the cloud spawns directly on him and it counts as killed in the cloud leading with Liege omen drops. Its really frustrating and annoying to do. Especially that they wont leave that cloud easily or just block on either textures or abyss pit and wont move out.
Its not fun to run abyss maps anymore if you have to do that. Especially on a juiced maps that dont give you a chance to do it sometimes.

(Im almost sure it works this way from the begining of the league start)

Here is a picture
https://imgur.com/a/TURYRrr