Essence Mobs not Frozen. Cant be damaged but can kill the player

Hey,

First of all im very sorry because i havent thought about reporting it here when i encountered the bug. All i did is i took a video for my friend. He then said i should still post here. I hope all the necessary information that i still have is contained in the video -->https://youtu.be/qhYzMUN9lqc

i havent specced anything into Essence, i didnt use any scarabs.


I hope this still may help.