An ending position is a pose, and the only problem is that the chest is in the wrong place. How is that any different from having the arms in the wrong spot in other places in the routine? Plus, you always judge to the benefit of the gymnast. I guarantee that every judge in my state would take it as a text error.
oh ok that that makes sense thanks also are you aloud to move your chest if you put it back where it is should be by the time the music is over? and can your put your hand on your leg or back if your chest is straight? and are you aloud to arch?
I'm not a judge, I'm just a gymnast, but I believe that you can put your hands on your back or legs, but I'm not sure about arching. I would suggest, however, to err on the side of caution. Good luck picking your ending!