Expanding Actions bar button don't work against the left side of the screen

Starting with 11.1, if you place an expanding action bar button (one that expands to give the choice of all you different pets, all your demons, all your portal destinations, etc.) on a vertical action bar against the left side the screen, the button will expand to the left (off the screen), instead of toward the center of the screen so you can see the buttons. They still work fine on the bottom against the right side of the screen.