Found by 2q1 and myself. Old dupe from 2017 still worked on Constantiam using End Portals. We couldn't tell anyone because it involved end spawn. Unfortunately, it got patched all of a sudden by completely disabling chests on entities on january 8, 2020.
If you really want to go through the effort, it still works with zombies holding items.
EDIT: Video was hidden because some people were too scared they'd be found zombie duping :p made available again after the zombie dupe also got patched.
![](https://i.ytimg.com/vi/uPhvgrz7ycg/maxresdefault.jpg)