As above, since installing Big sur the left side usb c ports don't seem to be working properly, there's no HDMI audio output, if i plug the same adapter in to the right side ports it works fine. Tried Resetting NVRAM and SMC, tried different HDMI adapters to no avail. I have no issue running win 10 via bootcamp the left side ports work with hdmi no issue. There is also a thread on reddit where others are having the same issue, i couldn't find a post on here so apologise if i have missed it. I have already reported this via the feedback assistance last month