Entered the end for the first time ever of 9 years playing Minecraft, to fight the ender dragon. The sky was a white TV static. All the end crystals except one were bedrock and the mobs were overworld mobs, hardly any endermen. Dragon flew around, took damage and was killed. An end city portal appeared but have not attempted going through yet. 

This world is quite old and has to travel to find a portal. 

Is there a way to fix this without starting a new world?