Some 16-inch MacBook Pro owners appear to have identified a shared issue suggesting the MagSafe 3 connector sometimes fails to deliver the expected charge when their Mac is turned off and the lid is closed.
As outlined on Reddit, some 16-inch MacBook Pro Models, when powered off, are failing to charge if the MagSafe connector is plugged in. Instead of turning green, the MagSafe light flashes amber and fails to deliver power to the Mac battery. Some customers have contacted Apple Support to find a solution, with varying degrees of success. One user, in particular, said that after a lengthy back and forth, Apple Support decided to send them a replacement laptop.
Read more at MacRumors.com