I noticed that one of my maps wasn't available in the transmogrifier list. I figured out that it was because it had the same name as another map, but it took me a while to debug. I'm not sure if this is intended, but if we are allowed to have things of the same name then we should also be allowed to transmogrify things of the same name. It would save the hassle of having to figure out why our maps/tokens/etc. aren't on the list.