Dura Ace crank blow-out - how rare?

My Dura Ace 9000 drive side crank blew up last week. See replies for the photo. I was on a 190km ride (https://strava.app.link/L7GZQlz556) and the drive side was making an increasingly nasty groan when out the saddle. I figured it was BB or pedal bearing, but right at the end of the ride the drive crank went as floppy as pasta. I managed to nurse it home, but was very surprised to see this. Nasty.

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