All factory HID headlight units need a vent hole to dissipate heat as the headlights are on. Otherwise, the heat will melt the polycarbonate housing over time and this would be even worse.
Let's see what your dealer say in HK and go from there.
btw, after my break-in, the moisture never came back. Funny thing is that I had changed car since and my current F10 (3 moths old) does not exhibit this moisture issue from day 1 at all.
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