I actually have an orthogonal issue, but I wonder if it's related. When I have an external monitor connected via a Thunderbolt dock, the device takes forever to wake from hibernation (that is to say when I've left it on sleep for several hours). i.e. 10+ seconds, which is kind of ridiculous in 2021. This doesn't happen when the monitor is not connected. I also have a similar amount of things open as you described