Same thing here.
Got a m1 mba in january, got it replaced last week... with the same issue. 😓
Since i had the opportunity to keep the old one while waiting for the new one, once i received the new one i did a few tests on the first one.
Even with a fully fresh install of mac OS, Nothing can change the weird behavior...
So now i'm a bit frustrated since i'm pretty sure this could be fixed with a software update (after all, these sensors work, they are just overly sensitive) and to me this just looks like a calibration issue.
I also to begin quite ashamed with the carbon footprint to resolve an issue that is so mundane, and could potentially not be resolved with a second replacement (and not even addressing the hassle of that whole reinstall/signin/signoff/sending back situation)...
Anyway, just adding my take on that issue, hoping Apple will notice and address.
Cheers guys