Taiwan Semiconductor Manufacturing Co. discovered this month that chips it made for a specific customer ended up with Huawei Technologies Co., a potential violation of US sanctions intended to sever the flow of technology to a Chinese national champion.TSMC halted shipments to the client around mid-October after it realized semiconductors fabricated for that entity had found their way into Huawei products, a person with direct knowledge of the matter said. The chipmaker has since notified the US...