Probably not likely to happen to many people now adays, but if you use an addon such as EveryQuest to keep track of what you have and haven't done, you may find that on some servers which were released after the original patching of these old epic mount quests, that when you hover over https://vanillawowdb.com/?quest=7675 Icy Blue Mechanostrider Replacement or https://vanillawowdb.com/?quest=7676 White Mechanostrider Replacement within the mod, or try to change it's completed status, you will get disconnected from the server for trying to query something that has never been seen on that server before.