Has anyone experienced uneven brake rotor ring wear on the Passenger Rear Wheel?

For some reason, this rotor on my '14 GTS with Stoptech 2-piece rotors has worn thin. We noticed this based on a clicking sound on coast-down braking. The car has 9k miles and the other rotors are fine, and the noise is only from this wheel and only on braking. The dealer replaced the hub bearing and the e-brake and the noise has been narrowed to the abnormal rotor wear. The car has original brake pads with plenty of pad left.

I will be replacing both rear rotor rings and pads to fix the issue, but was wondering if any others have experienced this issue.

Thanks!