After the 4.5.3 update, middle clicks don't behave correctly on groups

Up to 4.5.2, middle clicking window groups did what the user had set middle clicks to do on the tweaker option. ie: if set to close, it would close it; if set to switch to, it would open the window list as if you had pressed the left button, etc. After updating to 4.5.3, middle clicking window groups opens a new instance instead, regardless of what we set the button to do. Please fix this behavior so that it works as before.