Visual bug/goof with the quest "The Letter"

While playing this quest line which I received from Nineveh in Whispering Islet after several other pre-quests, the quest puts you into a instance with a meeting of all the major characters from around the game. One of those people is Zinnervale, however if you see in my screenshot, Zinnervale is using Thirain’s skin in the first part of the scene. I thought maybe he was playing a joke or something and used an illusion to look like him, but no mention of that occurs and when the cinematic starts, he is using his normal skin, and from that point on he looks normal for a bit and then goes back to looking like Thirain, so clearly this is a copy/paste oversight for the the scene.