When playing against the Ender Dragon, the dragon and the health bar seems to disappear at random without warning.

The situation was on a hosting Windows 10 PC (powerful enough PC and 50mbps connection), and a guest on Xbox One playing the Xbox Live version of MC. 

The dragon also may disappear or may be stuck in the map without being able to be hurt (both cases, the health bar is gone). In the plays, the dragon was not hurt, yet, but still disappeared without warning. Is abled to be respawned however, but issue can repeat again.

The audio may sound corrupted at certain points. 

The portal back to the regular overworld also appears without an egg or without any bonus experience.