Check your tyre pressures. I neglected mine for a little too long and caught the same problem fairly early.
The a couple of weeks ago I had a real puncture in one of the rears, and decided to get the worst front one done as well (and the better of the worn fronts moved to the rear).
The RFT monitor will detect a flat, but not just slightly lower pressure, but the car will be supported more on the sidewall in that situation, hence the abnormal wear.
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