I have my P6 configured to go to the black "screen saver" screen after pressing the power button. After the March update it can now take up to 7 presses to get there. Sometimes when in an app the lock screen will momentarily flash and the the screen goes back to the app. Sometimes it will go to the home screen and take a few presses to go to the lock screen. Once on the lock screen a single press will take it to the screen saver. I was originally using the Nova Launcher but the same thing happens with the Pixel launcher with Nova uninstalled. It even happens after restarting in safe mode.