The armor stand follows me when I placed invisibility, it should not be like that. I do not like to throw him a potion because the particles are visible.
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I also had this issue. For some reason the item place in the hand just follows you when you move, but will stay put when you rotate your camera. I even submitted a bug where the armor on the stand turns invisible whenever you effect the armor stand with invisibility.
search MCPE-43941 to see what I have submitted...