Sequencer - quick add camera - object is missing

In Sequencer , There is a feature given. " Quick Add Camera" , as documentation and tutorials , it should create a new camera , set it in new Camera Cut and should enter into Pilot mode for the new spawned camera.
but it doesn’t work like that , instead it shows read name of camera and shows object is missing .

After a bit of observation and research, I found that “Quick add Camera” Button in sequencer creates a spawning camera , that means when main shot reaches to starting of that sub-shot, it spawns new camera and after that it will destroy it automatically .
so if you check camera out of the shot, it’ll show object is missing
but when you are in to the shot, camera will be available.

That’s a really weird way for it to do things but thanks cause I was rather confused about that.