My 1st generation 12.9" iPad Pro stops charging after upgrading to iPadOS 16. When I plug it in, it starts charging normally, but then stops after a while, usually when it reaches around 94%, and then displays the text "not charging" where the battery indicator is. It seems like some kind of feature like ‘Optimized Battery Charging’ or ‘Clean Energy Charging’ is active, but AFAIK, neither of these are available on the iPad. Any ideas?