Hi all,
first of all, I can confirm the issue, happens also on my machine here.
Second, the workaround is to switch on the exclusive access option at the top of the control panel window. Then the headphones/speaker outputs will become stereo again.
Of course, the downturn then is that you can’t have other apps (e.g. YouTube) play out at the same time. A solution to that we don’t have (yet) and you may need to wait a bit. As I’ve just heard, our driver guy is unplanned absent due to illness.
I will come back with news as soon as I have them.