Still playing through, but there's one or two things that have really leapt out of me in the "This should be fixed?" so here we are.
I pickpocketed said key off her with Asterion, but he couldn't open Kagah's locked chest with it. I tried opening it on several different characters, tried via right-mouse clicking ('Unlocked' was greyed out with or without the key in the character's inventory). This culminated in a rather amusing mental image of Lae'zel carrying it past everyone on her back, outside where everyone could smash it open without being seen. So it's not a show-stopper-bug but it seems very strange.
