[Corner bug]

This is the default setting, so just play the game and you will see it.

 

also another thing I don’t understand is why I can’t change set piece instructions during a match. If I change formation , all these go back to default, I seriously had 0 defenders one time. There were 2 attackers alone on the midfield and all my players were in the box. 

[Corner bug]

Yeah, leaving the backs to stay behind really seems to help. Shouldn’t matter who stays though. 
 

classic example of how it works by default!

[Corner bug]

The players staying behind in defense always runs in press against the ball, leaving the attackers unmarked. 90% of my goals against comes from counter attacks on my offensive corners.