I recall someone coming across that kind of thing with 12.0: https://forums.macrumors.com/threads/iphone-x-xs-xsm-no-mute.2140892/I have noticed one thing. In iOS 12.1 despite the volume being completely down on Xs Max it is still outputting volume. I noticed it with YouTube. Anyone else?
Seems like a glitch of some sort most likely.
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