I just upgraded my MacBook Pro to MacOS Big Sur Version 11.0 Beta, and my battery, even though the power adapted is connected, is showing the message "Battery is not charging", while displaying this (new) icon:
My Mac is indeed not charging, even though the battery source is the power adapter. How is it possible to solve this issue?
UPDATE: This looks like a new feature of MacOS Big Sur. In the Battery settings, there is a new option called "Optimised battery charging" which stops battery charging after 80% to reducing battery ageing. By unchecking this option the battery starts charging again normally.