Just wiped to the final boss in a 15 M+ Mists of Tirna Scithe but after the boss disappeared we were unable to release. After the boss came back we still weren’t allowed to release. We all logged out and came back online and still unable to release. We then all left the group to get kicked out of the instance one by one and then reformed our group and were unable to enter the instance because an “encounter in progress”. It could’ve been Spirit of redemption, or the necrolord bonesmith thing that bugged it because we had both, but after we wiped we were never aloud to release and after we managed to teleport out we were unable to enter the instance to finish the key .
The boss did despawn when we wiped and reset perfectly fine, however the trigger that keeps you from releasing after engaging a boss never reset.