Open new instance with ctrl inconsistent behaviour - reasoning behind?

In overview, I see 3 ways to open a new instance of lets say terminal or nautilus.
1.) right click on icon and then click on new window
2.) via search: enter nautilus or nau and hit enter while pressing ctrl
3.) left click on icon while pressing ctrl

While 1 & 2 open a new instance and close overview, 3 opens a new instance and keeps overview open. I personally find this very annoying since I experience it as inconsistent. I wonder if there is any good reason for this behaviour and if there is a way to change 3 to also close overview, since it is my favorit way of opening a new instance.