Windows and doors that are vertically aligned seem to confuse the system. If I have a door in a wall with a window above or a lower window and an upper window, it seems to give both the same uuid which means that when we get updates it will only add one surface but it will randomly allocate the transform of one or the other, resulting in it flicking back and forth. Sometimes one of the windows seems to have a transform that covers both. Ideally, it would return two surfaces, once for each window or door. It works fine as long as no one tips the device up to the higher widow, after that it can be hard to get it to register the lower door or window underneath.
When I iterate through the data returned I can occasionally see multiple windows with the same uuid which suggests why it's getting confused.
I have tried keeping track of the duplicated uuids and adding multiple windows, but the transforms seem to be broken.