me and other people sent feedback about it, even posts made in this forum around 10 months, but it's still the same.
problem: as you can see in the gif above, when you press the pause/play button, its state doesn't change until you move the mouse cursor away from it.
pause/play button's state should change whether or not mouse cursor is over it.
this is the normal behavior of UI, but Edge is not doing it correctly.
Global media controls also exist in Chrome browser and they work correctly. i.e. the button's state changes no matter the mouse cursor is still over it or not.