Bug FaceMesh does not work after upgrading ARFoundation from 4.0.8 to 4.1.12

We've been using ARFoundation 4.0.8 for a long time in our Unity 2019.4 app. However, since there is a major issue on iOS 16, we had to update to 4.1.12. It kinda works, but the FaceMeshes are broken. They just won't show, although there is no errors in the Xcode logs. Were there any changes here?

Note: I saw that you now have to tick "Face Tracking" support in the ARKit project settings. I have done this. Before, I could not even switch to the front camera. This works now, but no face meshes are being applied to the face.