PlayStation M7: No Motor Sound On Some Cars

After previously making a post about small passengers on the M7, I've found another error.
Whenever you accelerate, for some reason only the back or front car's motors make the acceleration and braking sounds, whilst the rest do apply power, just don't make noise.
Not sure if anyone else has this, but do you?

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This has been the case since LIRR was released for TSW 2 and affects all platforms.