Bug Unity color picker doesn't work across monitors reliably

This has been a bug for as long as I've been using Unity! It just doesn't deal very well picking things on other applications, especially on different monitors.

 

What do you mean by this? What happens when you try? What does "doesn't deal very well" mean exactly?

 

In some cases it'll fail to recognise that I've picked a color, and gets stuck in color picking mode.
In others it'll be delayed to pick the color, or will pick colors in neighbouring pixels.
Curious if others have seen this, I've been noticing it across various versions and computers for years.