I have a competition with the FR US Cup class . Not sure if anyone else may have noticed, but when changing tires, there is no sound from the air impact wrench's. All other cars I have used has sound of tires being changed but not with the FR US class
Are you racing in a championship? I noticed that the sounds are there in single races, but not in championships.
What's the rule preset you're using in your championships? I can only think of that as a potential reason for this behavior to break.
It happened to me with both the custom and the ADAC GT Masters rules presets. The pit confirm sound also seems to be missing.