About ISO 639-3:min, there are no diacritics whatsoever. F, Q, V, and Z, despite being "non-native phonemes" (http://repositori.kemdikbud.go.id/2947/1/Kamus%20Minangkabau%20-%20Indonesia%20-%20335h.pdf), are used pretty frequently. X, it's a very rare letter, but I found that "verified" Javanese and Sundanese have also included that letter (which means it's the exact same with Indonesian?), so yeah.
Still debating on keeping this "preliminary" or "verified".
The ISO 639-3:xrg is an extinct dialect of ISO 639-3:nys and is not "Minangkabau" (ISO 639-3:min). (https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2012/2012-015_xrg.pdf) (https://en.wikipedia.org/wiki/Nyungar_language) (https://www.ethnologue.com/language/xrg)
About ISO 639-3:min, there are no diacritics whatsoever. F, Q, V, and Z, despite being "non-native phonemes" (http://repositori.kemdikbud.go.id/2947/1/Kamus%20Minangkabau%20-%20Indonesia%20-%20335h.pdf), are used pretty frequently. X, it's a very rare letter, but I found that "verified" Javanese and Sundanese have also included that letter (which means it's the exact same with Indonesian?), so yeah.
Still debating on keeping this "preliminary" or "verified".