I did some more testing and I think I figured out how to reproduce it. I used another character that was created after hotfix 15, a wood elf ranger->beastmaster. The first time I got there I didn't use stealth walking into the room, and the issue didn't occur. If I use Shadowheart's spell to increase the main character's sneak, then make everyone sneak, select the Githyanki to be who is leading the group, then walk into the room, it triggers combat for the imps but the mindflayer and Commander keep fighting till death outside of the turn based system.
I don't know if any of the rest is important or just sneaking will cause it, but I think that should be enough information.
Last edited by Sumshine; 13/09/21 08:46 PM.