I dont know about the sport, but I have a 2019 model too, and dealer said the same - reasoning was it t=didnt have the mount for the spare wheel - rubbish - it does, its under the carpet
I'm getting this problem too. Tyres all have similar depth but miss-matched brands - front are both goodyear, but one rear is a michelin, and the other a pirelli - I've only had the car 2 weeks so not me - do you think this could be the issue