Vaal Factory - Rare Mob

On the Vaal Factory map there is a rare, archer mob that cannot be damaged. I encounter it more than half of the factory maps.

It was before and after 0.1.1.
Happens for others players.
Cannot complete map.
Mob can damage/kill you if you aren't paying attention.

Maybe it has proxy-whats-its-name. It can only be damaged if you stand within melee range.

Encountering this mob in other maps now too. This is not a proximity issue but an issue with this particular spawn. There are TONS of bug posts here in the forum alone. Just search "mob" in the bug reports and nearly ever post is about this one rare.

Can we just remove it until it is fixed? I've wasted over 20+ high level maps because of this one damn mob.

Bug report reference: 3,536,715,812

Picture of mob now appearing in the Hidden Grotto map.