Similar problem to the previous email (I think). See <https://incubator.wikimedia.org/wiki/Incubator:Administrators%27_noticeboard#Wp/mni-beng_as_a_test_wiki>.

In this case, I think the best solution might be that we encourage the community to obtain a separate ISO 639-3 code, as the language(s) also seem to have other differences apart from the writing system.