@gritzollen Since the 1.04 patch I went to the location to see if things were unbugged and no luck. Goneril is still dead on the ground after I killed her and an audio effect is glitched and repeating.
I've killed the other 2 sisters just fine so far. I managed to kill Goneril but her corpse is now glitched on the ground with a sound effect repeating. I can leave the area and get the "leave area" warning but carry on and nothing resets or changes.