Interesting wear pattern. I’m wondering if something got loose in there, and that is just where it got trapped? I am really surprised that the rod can spin that much. Was the ball in place in the pressure plate? Is the clutch end of that rod somehow damaged too?
Many moons ago, when I put a clutch in a 60’s car and got a good look at the parts: I decided forevermore to spend as little time as possible with the clutch pedal pressed. Have carried that over to motorcycles, and karting too. I never sit more than a couple of seconds with the clutch cable in tension, preferring neutral in the gearbox as a better alternative.