if you are in the automation window and cut all recorded automation datas out (ctrl + a , ctrl + x) the green sign of “used as automation” parameter is already there.
Its a small bug, but if have automated datas and delete every single value with double click on the bullet, the green sign is gone, after you delete the last automation bullet.
Well, the automation is still there - technically, but has no automation points. You can still move around with the cursor and create points and so on, which you cant when the automation is completely deleted. Handy for keyboard usage IMHO.