Just a reminder that this is a proof of concept. This add-ons is meant to showcase a demo of what can be done with the new Item Dynamic Properties. Unfortunately, due to API limitations, not all entities will be copied over perfectly. Here's a list of entities I tested with that isn't perfect:
Due to a Mojang imposed limitation for stability reasons, we are unable to get an entity's inventory so entities with armour or tools will lose them upon spawning