I was tweaking the end.txt file to change the text that is showing up when you complete the game. I killed the dragon and respawned him in again and logged out of the world before some of the end crystals on the towers weren't light up. And when I logged in again, it stops the respawning process and nothing happened.

Steps to Reproduce:

1. Respawn the Ender Dragon

2. Logg out of the world

3. Join the world again