When an armor stand is invisible, the item it holds follows the player as they move. If the armor stand leaves the entity render distance, the item is no longer loaded. The item reloads when you enter the area where the armor stand is loaded in the same position in proportion to where the player was initially when the stand became invisible. When the armor stand leaves your view, the item also derenders. when you walk past the armor stand, the item also follows past. For example, if you are to be looking slightly off center to an armor stand that's holding an item, then you hit it with an invisibility potion, the item will follow you even as you back up or get closer, all the while keeping its original distance to the player. The item in the invisible armor stand's hand will also jump to any nearby visible armor stand's hands when the player approaches them, this is only a visual bug and does not actually affect what the visible armor stand is holding, just displaying any actual items being held in the same space as the invisible stand's item at the same time.

I have created a video to give a visual to the issue I'm detailing, This issue is causing some issues in a Map I've been working on for a while and I'd really hate for the map to be broken by this Glitch,

Video: https://youtu.be/QxVIebsG5Bg