Wow, that sucks. Don't let a dealer tell you that "it will go away". Water inside a headlight is a quick way to speed up the process of a headlight losing its sharp clarity, i.e getting "yellowy" and fuzzy over time.
I had a Chevy Malibu that had this issue and GM replaced both headlights. It would be insanely unacceptable if BMW did anything but.
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