I'm surprised there was enough fatigue for it to break through like that, doesn't look like there's any rust. I wonder if the alignment was off enough that the door was closing but it was flexing up/down/in/out every time it was closed?

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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)