Why has Apple included commercial fonts in its new templates?
The new templates are using commercial fonts unavailable to regular Pages users.
This is causing templates to fall apart.
I know you can substitute fonts, but that is a bad start to the "gorgeous" new templates. Apple should confine itself to fonts that are installed in the current macOS to ensure this does not happen. By all means expand the installed fonts to improve the selection, but do not fail to do both.
I've commented before on the competence of current Apple employees and the propensity to check their own work, so shall not do it again.