Adaptions (para. 19) should cover using same license as adapted project.
This section could include explicitly that if adaptions are made to existing open source software that it should be licensed under the same license as the original code base or one in keeping with that particular open source ecosystems community norms recommended in NZGOAL-SE. I'm not sure if this was explicitly mentioned in other sections of NZGOAL-SE draft?
For example, a government agency releasing a SilverStripe CMS module could use BSD or MIT (SilverStripe CMS is originally under BSD). MIT's "permissiveness" fits in with the original projects BSD origin if the agency wanted to keep tight to NZGOAL-SE. Same deal if adapting something like Moodle (GPL v3) the Moodle community would expect GPL adaptions back.