Miramar rear brake bug

There's no rear brakes or parking brakes for the rear axle if you use the Independent Front Suspension with front drum brakes and Race Rear suspension with race brakes. Changing the front brakes to race brakes and it works again. Front disc brake (non-race) seems to give you rear brakes if you used front race brakes before, but not with drum brakes.

 

Race rear disc brakes won´t work without race front discs in any car. Most likely something to do with the lack of f/r bias setting.
Race and drag race rear drums are working fine with or without any front brakes.*

Another brake related bug is that the Vehicle Damage App warns about brake damage after axle failure even if the car has no brakes.

*edit: except Miramar´s race rear aluminum drums as OP told.