Big Sur: Facetime does not use existing bluetooth connection when answering
I am on Big Sur on a Mac mini and when I am wearing a Bluetooth headset, listening to music, and a FaceTime call comes in, audio and microphone are both switched to the computer's speaker and mic (both external and they don't work very well). This is not at all the behaviour I had on Catalina, where the currently used BT connection was used, which, by the way, makes a lot of sense. Is this a feature of Big Sur and if so, what has the person smoked who came up with that? For the last two days, I had to switch to answering all my FaceTime calls on my iPhone because I could not figure out in the 5 seconds I had to answer the call how to switch the Mac FaceTime to the right input/output sources. I have figured it out now but it clearly takes too long because I must first move the mouse to the menu bar and switch the audio output , then I must move the mouse a second time to the menu bar and switch the audio input. By that time, the caller has hung up. Why isn't there a setting for Facetime to use the existing BT connection?
Mac mini, macOS 10.13