Encountered yet another bug today during the 'A weapon from the past' mission:
We were at the second to last altar with the sphere when it got stolen by a wardog enemy. The enemy managed to place it on their altar. We were playing against a Konstantin antagonist during that match and so he tried to stop us from regaining the sphere by unleashing his special ability. After we had eliminated the antag, the enemy altar where the sphere was resting was floating above the ground at a weird angle and we couldn't remove the sphere from it. I don't know if it had anything to do with Konstantin's special attack, but we lost the match because of this unfortunate issue...