I have family in the auto industry, and they have similar stories. They'll get a shipment and it'll be out of spec. So they contact the vendor and the vendor will just say, "No, they're fine. Parts are good." No, they're out of spec and you need to fix them. Look, I can show you. "No, parts are good." And you'll go around and around like that. They won't care and won't budge.
Until you say, "Well, since these are out of spec, we're not paying for them. That's in the contract." And now it's suddenly a problem for them!
But the Korean and Japanese can be even weirder, because they will often only listen to someone if they have at least as much seniority as them. Like it won't matter how right you are, just your position.