The video pretty much tells it all . https://youtu.be/cJZfE9Fu5vw

And it is uploaded to YouTube because this website still doesn’t allow videos above a ridiculously small size.

So not sure how you would go about reproducing this but basically I have this realm that I have been playing in for almost a year we defeated the dragon over 20 times and got all the extra portals and now today (first time since 1.12.1 hotfix (which i think touch on the fewest issues ever for a hotfix) (cant rememebr but im thinking they touched on the dragon or the end something) so I go in there to start mining, and the dragon seemed to of spawned itself... regardless of semantics of the possibility of another player spawning it that most likely didnt happen me and the one other player hasnt been on since the hot fix. I’m like great now I have to fight the dragon and I’m totally not ready for it so I start to go up a tower
And multiple end crystals are unbreakable. One even is stuck on the respawning animation, where it shoots out the particles. I shoot it i hit it and nothing, blocks can even place around it, (i cant remember if that was allowed? Maybe im thinking of another block). So dragon is nearly impossible to kill till this gets fixed. Mojang needs to really stop slowdown and stop putting bandaids over bandaids and just correct the codebase.