ok since comparators where able to give a redstone signal from item frames if you do that and log out and back into that world ALL entitys will be duplicated arrows like 4 stacks of the item in the item frame will burst out plus 4 stacks of item frames any entity except the player will be duplicated go to this link to see the proof and a way how to redo it https://www.youtube.com/watch?v=2q-ZLgTTPT0