Killing entitiys holding items while they are being pushed through an ender portal causes item duplications

This bug has been in the game for awhile, and has been sadly ignored despite the detrimental effects it has on multiplayer servers. It essentially works by getting an entity that can hold items like a donkey or llama down to half a heart, and pushing it into an end portal while simultaneously killing it with something like lava. this causes the entity to drop its items in the overworld, and also causes a living version of the entity to spawn in the end, still holding all of its items.

This can be reliably replicated, and this short video demonstrates the glitch well: https://www.youtube.com/watch?v=THUeJcKXoJM