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2020 M3 - Headlight question

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Has anybody seen this inside of the headlight assembly before? It's on the driver's side (LH) headlight I've searched online but I've never seen this on anybody else's, I can't think of what it could be or what it's for.

I just purchased this car from a nearby dealership and noticed it 2 days later. The headlights seem to work perfectly fine, there's no damage that I'm aware of. I haven't been able to check if it's OEM or not.
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TIA