A loose bearing can also cause that wear. Probably not likely on a newer unit though.
A few weeks ago I helped someone in a CG put on a spare tire on his pre-owned TT because he had no jack or tire iron. The flat one had the tread badly worn on the inside which I expected to be caused by a bent axle. Turned out that he had a rather loose wheel bearing on that wheel and also the other one on that side. The PO had replaced and repacked the bearings, but obviously not properly.