hridaymasnani , via OnePlus 6 Midnight Black , Nov 26, 2020 : I have noticed this for a very long time that on my OP6, the Medio Output is incorrectly reflected. Even when I am connected to bluetooth, the media output shows "phone speaker". Have observed this for a very long time. Also, a suggestion I'd like to provide is providing the recently/frequently paired/used bluetooth devices to show in the Media Output shortcut and not merely display devices in alphabetical order. This will provide the use plenty of comfort I believe since shortcuts are meant to provide "shortcuts"
