An investigation of Huawei Technologies Co.’s latest AI offering has unearthed an advanced processor made by Nvidia Corp. manufacturing partner Taiwan Semiconductor Manufacturing Co., suggesting that China is still struggling to reliably make its own advanced chips in sufficient quantities.

Taiwan Semiconductor Manufacturing Company notified the U.S. that one of its chips had been found in a Huawei product after tech research firm TechInsights took apart the product, a person familiar with the matter said,

The anonymous sources says TechInsights’ investigation found an Ascend 910B chip made by TSMC in one of Huawei’s AI accelerators. The company that conducted the investigation declined to comment. The US Commerce Department implemented additional trade restrictions against Huawei that barred the electronics company from obtaining chips made by foreign firms.