While many BMW models do have excessive internal fogging (condensation) with their headlights, BMW claims that this is not always a "failure".
I've attached the Headlight Fogging TIS for the G12 and let you be the judge of your own vehicle.
If you deem it's an issue, I would first suspect the outer corner of the headlight assembly. If you are able to dry the internals, there are ways to seal the unit w/o replacing the lens or bucket, but it won't be pretty.
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