It’s likely to do with grounding. I’ve had it reliably in one location, but then with the same MacBook it doesn’t do it in another location. Probably grounding-related.
It used to only happen when I had it plugged in, initially when I took my MacBook to Romania a few years ago and plugged it into the power grid there, they use a different frequency and I had to use an adaptor. But then it started happening in the US as well, and even after I switched from the 2020 model to the new M series, and now it happens to me even when its not plugged in anything, whether I'm grounded or not...that's why I'm wondering if they're actively changing the EM field encapsulation specs.