After installing from the packaged wheel, any attempts to use commands beneath the top level "aosm" currently fail, because the submodules can't be found within the extension. This includes help commands:

developer@Ephemera:~$ az aosm definition --help
The command failed with an unexpected error. Here is the traceback:
No module named 'azext_aosm.generate_nfd'

A lengthy stack trace also follows, but the key thing here is that generate_nfd is not found within azext_aosm.

This is because when building the list of packages to include we use setuptools, specifically the find_packages() function, which doesn't recognise this as a valid submodule because it lacks an __init__.py. The same is true of other modules within the extension, this just happens to be the one we hit first.