Yes, happened on mine last year, when the original pan was 20 years old. I don't have any explanation for why it happened, no obvious trauma to the part, so I imagine it was age and the fact that the pan has been removed and re-installed a number of times over those 20 years, that it might have been incorrectly torqued at some point. A new OE pan fixed the leaking.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't