It might also be
A case of bait and switch from the suppliers. They start off with good quality sample products that get certified even if need be, then once production is in full swing replace add much as possible with cheaper parts regardless of if it's safe or not. Think 13amp fuses that turned out to be just solid lumps of steel painted to look like fuses in bulk orders of kettle leads.
That was a fun recall.... though good record keeping is your friend in this regards.