I noticed the same thing, but it only happens when I cannot or do not precondition - IOW, while the interior is really cold. Because the car had sat in their workshop for awhile after me driving it there, they couldn't reproduce it. So, yes, you are not alone, but you may need to let it sit outside at the dealer for them to be able to hear it, and, it doesn't' seem to last all that long, so it may be a real problem isolating it. I don't think it is hurting anything except maybe one's sanity. Play the radio louder!
2014 i3 BEV, 2021 X5 45e
(The i3 will be sold soon, <17K-miles, interested?)