Before starting any production, you need to send the manufacturer a specification that describes what and where to solder, so that everything works according to the author's idea. We have a special chip-antenna in the specification on the NOTA board, through which Bluetooth transmits the mole survey data to the app on the phone. And just before the launch, it turns out that manufacturers can't get a chip-antenna. We have provided for this problem in advance, so the board has the ability to use not the chip-antenna, but the antenna that is divorced on the board. It has modest characteristics, but they are quite enough to transmit NOTA measurements, since the device does not require a long distance to work.
We made a new documentation where the resistor is soldered differently so that the antenna divorced on the board works, and sent the documentation to production.
But then the human factor intervened: manufacturers used the first version of the specification. It is quite difficult to remotely control what documentation is used. Everything is built on trust: if the manager said that he will send a new specification for production, then we can only hope that the information will really reach.