Dragon Duplication Minecraft Java 1.21 (Also dragons while having an active portal)

Описание: Showcasing a method i discovered to duplicate the ender dragon. This can also be used to retain dragons while having an active end portal. Im not sure if anyone else has found this method as i couldnt find any videos about it, but i could just be bad at searching.
As far as im aware, this is the only way of duplicating dragons as well as retaining them with an active portal in 1.20 + as that version patched the gateway teleportation with dragons.
Yeah sorry for the low quality and my terrible voice, i just wanted to show that this is possible.
(Has handmade subtitles to compensate)