Hi, everyone. I have the same problem here, only when running Xcode (simulator). I have a MBP 13.3-inch, 2020. I have tried some way to fix it but noting happen. Here are what I tried:
(1) Big Sur 11.0.1 + Xcode 12.x (Include beta version) ❌
(2) Big Sur 11.1 Beta + Xcode 12.x (Include beta version) ❌
(3) Big Sur 11.0.1 + Xcode 11.7 ✅
(4) Catalina 10.15.7 + Xcode 12.2 ✅
And I have no idea. Pless fix it.