Proximal Tangibility issue with aura/blasphemy

Issue:
Enemy with "Proximal Tangibility" was functionally invincible until aura/blasphemy was disabled.

Character details:
Level 75 Witch, ascended to Lich
Withering Presence (level 7 gem with +2 modifiers) with:
Clarity
Persistence
Chaos Mastery

Blasphemy (level ten gem) with:
Temporal Chains (level 13 gem with +5 modifiers)
Ritualistic Curse
Focused Curse


Description:
During a level 65 the Trial of Sekhemas, on the third floor, during a Chalice Trial, one of the enemies had "Proximal Tangibility." No matter how close I got, he would never become tangible. I stayed close to him for a full twenty seconds, trying a variety of things: I ran into him, ran circles around him, sent minions after him, all without any effect. Once I turned off Withering Presence and Blasphemy, he became tangible when I was close and could be killed normally.