Extra champion bug

If you go into a carousel when you have a full bench, the hero you choose will be places on the battlefield even if you have a max number already out. So you can fight the next round with an extra hero. As soon and you open a bench spot the hero will move to the bench if you are over the team size. I did this mid fight one time and the hero left the battle field, then came back onto the battlefield from the bench, mid fight, but just stood around. I won the match before that hero was the last man standing so im unsure if he still effects combat (takes hits/ soaks time) once re-entering.