If both are showing the same damage, then it can't be the result of impact, so it is likely either indigenous or the effect of some substance that has been applied to both, or just plain age (but the car is not very old). In any case, very odd.
I would try to contact BMW North America directly, not in an aggressive way but just as a heads-up, to say "Hey, look at this. Any ideas of what it could be?"
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