That happens with the ungrounded two-prong power adapter connector (the one that comes in the box). If you have a three-prong power adapter extension cable, it

That happens with the ungrounded two-prong power adapter connector (the one that comes in the box). If you have a three-prong power adapter extension cable, it won't do that.[^1] Apple used to include one of those in the box too, but they stopped around 2015 or 2016. [^1]: https://www.apple.com/shop/product/MK122LL/A/power-adapter-extension-cable https://www.apple.com/shop/product/MK122LL/A/power-adapter-e...