I worked for a company a long time ago that produced equipment for Vestax and dbx. When we were wrapping up testing of a new build it wasn't uncommon to incorporate parts of test rigs if it meant making a shipping schedule. However, we would always use 'Dust Off' or an alcohol dip before incorporating the parts before shipping.
Maybe it got dusty during shipping. Lol /s
Anyway what can you expect from Bitmain, they are clearly profit-oriented. Any decently reputable company would let such a thing slide through QA and if one did ever come out, they would have been all over the situation before it got too mainstream. Good luck to all Z9 buyers.