Crossfirekira

This has showed up as of yesterday for me as well. The last parrot that I carried will teleport from its location where I sat it to my shoulder. So far this has only happened within the four chunks around my base. 

When fighting the wither boss, I knocked its health down past half, then down to empty. The boss acted like it was going to explode, then didn't. The health bar maintained the the empty status. I died and returned. Health bar remained empty. I hit it a few times and the bar jumped up to half health. Upon dying and returning a second time, the bar did not appear at all, even when the wither was within 4 blocks of the player. 

I was playing on a realm on version 1.11.1. another player at the time could visually confirm that there was no health bar, so issue was not client-side. Realm admin switched the world to peaceful to kill it. 

I will add to this. If you place a block where you have just beoken a seagrass, the block will take a partially broken animation, as if the breaking of the block has been paused. Breaking the block after placing it will fix the texture.

I am having the same issue on Minecraft Windows 10 edition. I have had 3 dragons in the end when I die. Currently, three appears to be the maximum. I am playing on a Lenovo Windows 10.