I just started a playthrough of the backer beta on easy; trial of Iron. I got wiped fighting Medred (is that her name) I took care of her group just fine, but she used "shadowing beyond" and never became visible again. She killed me while only being two stilletos floating in mid-air, attacking from extreme invisibillity. I could mouse over her selection circle, but not target her. She also didn't seem to take any damage from splash. So uhm my party died and I lost, aint got no saves since it was all trial of Iron.

 

Expected result: enemies becoming visible after attacking or set amount of time, after using "shadowing beyond"

 

Actual result: party wipe from immortal apparition.

 

-peace

Encountered the same, the only thing remaining was the red circle. Murderous circle.

This or a similar bug happens with escape too.  Happened to my rogue when I used escape while being chased by the fire projectiles that the little dragons shoot.