This was working for me during testing, but seems to have cropped up somewhere around release time. If I unmaximize all open windows, the left-side trigger works as intended, but at soon as I maximize one window, the launcher no longer appears no matter how hard I hit the left edge. Also, when this happens, Super just makes everything pale as if dash and launcher were opened on top, but they’re not. Doubly also, there is some gesture that makes things work again, but I have yet to pinpoint what exactly it is. (I just had it happen briefly after temporarily disabling autohide, but that alone wasn’t yet it.)