Since May 31, 2019 PACCAR has recalled Kenworth T680, T880, and W990 vehicles along with certain 2020 Peterbilts numbered 520 and 579.
According to the recall, the mirror glass may detach due to inadequate adhesion. This could result in the glass being a road hazard and cause reduced visibility for the driver.
Here is the link to the recall information at the National Highway Traffic Safety Administration: https://www.nhtsa.gov/vehicle/2020/PETERBILT/567#recalls