DirectOptionMenu - popupMarker_pos doesn't do anything?

There is a very old post about this already but it didn’t really recieve any attention so I am trying again.

I am trying to use a DirectOptionMenu but I would like the dropdown menu to not drop down from the top right of the menu (obscuring half the menu button). I thought that this is what the popupMarker_pos was meant for, but no matter what I pass in for this parameter it always drops down from the same place. Im not doing anything with the DirectOptionMenu after I make it, and I print the popupMarker_pos parameter after to make sure it is what I set it to (and it is), so Im pretty confused.

Does anyone else have this problem or know of a solution?