This may have been posted not sure couldn't find any.
This bug has been in and out of the game since I can remember and it's a great time saver if the mobs you are looting are a fair distance from each other. Pretty much kill the mob then mount up, as you're cast bar for your mount is about 4/5ths complete (really close) just loot the mob and you should be looting while mounted. Enjoy :3