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I discovered this issue many years ago and as far as I can remember there is nothing you can do about it. For some reason Photoshop is randomly adding some kind of anti-aliasing to any rectangle you draw and no matter what you do, nothing seems to make it go away, even if you snap to guides or a grid. Nobody else in those days had an answer either. It's another example (of many) why Photoshop is terrible for any kind of serious vector work.