Netplan renderer only works with specific file name

Hardware: Dell Gateway 500 Series
OS: Ubuntu Core 16

If I add the renderer option of NetworkManager to my config file when using netplan it doesn’t work. If the only contents of the default render file have this defined then it works. If you attempt to call the file containing the renderer anything other than what it is by defualt, it will not recognize it.

Default file Name:
00-default-nm-renderer.yaml

Contents
network:
renderer: NetworkManager

If you change the name of that default file to anything other than that, netplan will not use NetworkManager. I ran under the assumption it was alphabetical so I made sure to re-name it with a similar 00- prefix so it was always first in the file list but that is not the case. I doubt the intention is to force a specific file name for configuration but if it is, I haven’t found documentation to support this behavior.