Abyssal Rare causing Mineshaft map to crash [0.3.1]

On my first map in this new patch, I am running into an issue with a specific rare and am unsure which modifier is causing it.

This is definitely an Abyssal enemy, a Lightless Abomination, a rare with Soul Siphon and regenerating health.

The rest of the map runs fine, but over time this rare was causing its specific area of the map to lag quite a bit, and after defeating the map boss, I tried to revisit it and it has caused my game to crash to the login screen. After attempting to reenter the map from login, the game crashes entirely.

Doubt it makes a difference, but this is within a map I had to rerun due to using up all tries the first time. No tablets applied and only a blue T2 map.

Seeing same thing in other maps: https://www.pathofexile.com/forum/view-thread/3862466/page/1#p26389961

After running a few more maps, I feel pretty confident that it can be narrowed down to the Soul Siphoner modifier. I managed to kill it before it could crash my game, but it definitely creates lag multiplicatively over time, which seems to indicate an effect bug of some kind.