system-zones tries to deliver global-zone only template files into NGZ
It turns out that the system-zones manifest tries to deliver the files SUNWblank.xml and SUNWdefault.xml as files that are entries of the /etc/zones/ directory. It does not identify these files as global-zone only components.
However, the parent directory for these files is identified as a global-zone only thing. And the files themselves are completely useless in a non-global zone context.
The files should be marked in the manifest as global-zone only.