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As another data point:
I have a 2017 330i and I've noticed this too. Below 1/4 tank the knocking is pretty evident, though not as pronounced as some of the previous videos. That being said, I didn't reach under the car to record, and it was only heard in the cabin. I'm taking it in in a few days to work a separate issue and I'll report back if BMW has any fixes (although I'm sure they're going to align with the notion of it being within "within spec").
Onto other rattles and fixes that I've experienced:
I had a pretty bad rattle in the shelf behind the rear seats. The dealer applied felt tape to all the points of contact and that rattle is now nonexistent.
When I'm playing songs with any sort of bass, there's a very "ghetto" rattle that's heard from outside the car. This rattling is coming from the side skirts and the aforementioned fix did the trick as well. I'm actually taking my car in in a few days to fix the right side (wish I would have just done both when I was in last time).
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