This is working as designed. For accuracy of image, you set it to Medium. If you care more about blooming, you want it set to High.So can anyone confirm if Auto Local Dimming set to High is bugged, or is it actually working as intended? Basically with it on High, if there is a small bright box in the center of the screen, it is actually dimmer than with it on Medium. Not only that, but setting it to High also seems to mess up the white balance and clips some whites! It's very obvious on certain images if you switch back and forth between the settings.
It doesn't seem to be a big issue leaving it on Medium, but it definitely doesn't let the screen get as inky black as it can on High (hard to notice in normal usage).
I noticed a couple of posts in this thread refered to this same issue but the discussion never went anywhere other than "Medium is the proper setting".
So in summary, firmware bug or working as intended?