"Quick note" hot corner not working
I think I found a bug. So when an app on my second display has focus, the quick note does not work. If I give an app in display 1 has focus, quick note works.
Even weirder is that it does work the first time after giving an app on display 1 focus, but it starts working on the second try.
I had same issue with second monitor. I went to hot corner settings in preferences. The right bottom corner was showing "quick notes". I changed it to some other option and then changed it back. Now it's working. Hope it helps you.