Essentially, nm_connection_get_path() mirros nm_dbus_object_get_path().
However, when cloning a simple-connection, the path also gets cloned.

I think this field doesn't belong to NMConnection in the first place,
because NMConnection is not a D-Bus object. NMSettingsConnection (in
core) and NMRemoteConnection (in libnm) is.

Don't use the misleading alias, but use nm_dbus_object_get_path()
directly.