[Atlas map] untargetable and unkillable rare in map

[unkillable rare][https://imgur.com/a/IxMM2cD]

In the Vaal temple map, I encountered a rare mob that could not be killed and also could not be selected. It was stuck in the death animation however it did not count as dead and as such I could not complete the map. It also dealt dmg and used abilities as normal.

bug report ID number: 98413380

FIY: I had a party member who died on the map as well