Also, here is a link to the project: https://www.simscale.com/workbench/?pid=2633798439183855862&mi=spec%3A49363a72-8e3d-402e-8c22-1b26de03e3db%2Cservice%3ASIMULATION%2Cstrategy%3A1
The mesh in question is “Undertray Mesh”, the missing face is on the underbody