Intended or mistake ?

Hi,

Im playing a Thorns build.
In Atziri's temple (league mecanic), in the room Apex of Oblation (Contains a device to modify Vaal uniques), at any level of the room, unique monster in it isn't doing any HIT, only spells not hitting, so i just can't do this room, i have always have to press "Respawn at checkpoint".

Is this intended ?

Ty