I had this problem on my 2019 i9 MBP. It seemed to involve the keyboard. One way to trigger it was to use the calculator app. Entering simple arithmetic express

I had this problem on my 2019 i9 MBP. It seemed to involve the keyboard. One way to trigger it was to use the calculator app. Entering simple arithmetic expressions (e.g., '3' then '+' then '4' then '+' then ... '=') with the built-in keyboard would often result in the result not being displayed until I moved the mouse pointer using the built-in trackpad.