Einhar mission completes ignoring essence duplicated beast

Evening GGG! Thanks for the awesome league so far.

Bug Report 2,209,474,133

I am specced into Essence. I have the Shrieking Essence Mobs are Duplicated atlas mod. One of my essence pillars became an Einhar beast when I put his mission on the map and duplicated when opened as a result of the atlas node. I struggled to kill one of them when they popped out, decided to do the rest of the map first and come back to kill the duplicate at the end. When I killed all the other beasts in the map, Einhar left me (alone to die), but the duplicated essence mob was still there.

I didn't manage to get it down to half health to see if he would come back, and certainly didn't manage to kill it to see if it would die on its own without Einhar's help. Sorry about that!

Imgur: https://imgur.com/a/DwWkqkH
Sorry for the ultra wide causing bad scaling. The beast icon is visible on the minimap, as is the Einhar mission complete notice.