Hey, I agree that it should be changed back then (2012-2014) to two side so that when released you would fall down into tele. Still this was tested a lot of times on old ddrace and probably if the other player wouldn't release you and instead just go left or right (as far as possible), he should be able to get you out. Maybe on ddnet stoppers work a little bit diffrent.
I don't recall this kind of thing happening on old ddrace (that's why it was never changed). This map was very popular so we would notice this bug and change it. (edited)