I think this has been figured out. I too am perplexed by this but I changed the main dial to control the aperture in manual mode and that causes it to bracket with the aperture. If you change the main dial to control the shutter in manual mode it wil...
For what it's worth, I shoot weddings, portraits and real estate. I always set my main dial to adjust aperture in M mode because the only 2 ways I shoot is AV and M so the main dial is always the same. I shoot 360 panos for real estate in AEB to avoi...