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I’ve had this problem too my 16 Pro Max has very erratic MagSafe charging. I have documented and reported to Apple and the feedback app is showing “more than 10” which means there’s a lot of people have reported this and it certainly will be fixed. Hopefully in the next Beta.I had issues charging with MagSafe during the beta. It wouldn’t charge some nights or would only partially charge other times. I quit using MagSafe for now.