Killing the ender dragon causes the game to corrupt and lag

I discovered that in the latest preview the end is corrupted after defeating the dragon.

To reproduce:

1. Go to the end dimension

2. Kill the dragon

3. Check the results

Observed results: The dragon dead sound does not play, the animation continues forever, the dragon doesn't drop experience, the exit portal doesn't open, the end gateway doesn't spawn and after that the game lags.

Expected results: The dragon finishes the dead animation, the exit portal opens and end gateway spawns, the dragon drops experience and the game should function normally.

I tested it both killing the dragon with a weapon and commands and it is like that. Then my precious world is gone forever.