Since my post, I think there have been a few other cases, your car being one of them. At the time, my father-in-law, who works in motor parts said he'd heard there was a flaw with the 'bushing' "Bushings are cushions made of rubber, polyurethane (often shortened to “poly” or “urethane”) or other materials. They're mounted on car suspension and steering joints to absorb road bumps, control the amount of movement in the joints and reduce noise and vibration."
When I menitoned that to the Mitsubishi dealer, they said no.
But when I took the car in for a service this year in January 2020, I asked them again and they said that yes it was a problem with the Bushings on that make/model. They said they would replace them before my next NCT and they didn't need replacing during the service.
So I would definitely question them on this.
Hope this helps.