Here is a list of all the problems that occurred to me the first time I have entered The End.

-The world never loads and states "building terrain". When I shut down minecraft completely while this is happening and then reenter my world, then everything loads fine.

-Enderman attack me even with a pumpkin mask on

-The dragon was invisible for about 10 minutes but the dragon breathe could still hit me no matter where I was on the island. The boss bar wouldn't show up even in the middle of the island until I could see the dragon 10 minutes in (all end crystals were destroyed if that matters)

-Totem of undying did not work and just shook repeatedly when I died from many enderman attacking me

-The dragon kept getting stuck on the end portal and would take no damage no matter where I hit it on the map

-When I entered the next few times into The End the dragon would kill me instantly whenever it touched me

I hope these issues can be fixed because it is technically impossible to defeat the Enderdragon with all of these problems.