Mounting up on Traveler’s Tundra Mammoth in a cross-faction dungeon causes the vendors on the mount to have an orange name and are unable to be interacted with by the mount owner. I am not sure if the team leader, or the owner of the mythic key, was Horde (I am Alliance), but I assume one or both of those things was true.
Yeah I had this as well.
The work-around is to zone out of the instance – then the vendors can be interacted with. Not great if you’re working on timing a key and you’re not close to the entrance though.
I am having the same issue. Has anyone heard if this is going to be fixed?