Put the summary of the bug you're having here
Whenever I spawn in an ender dragon, it only just flaps its wings and does nothing. Can you help me?
What I expected to happen was...:
Describe what you thought should happen here
I thought the ender dragon was going to destroy my world, but it didn't
Describe what happened here

Steps to Reproduce:

Put a step by step guide on how to trigger the bug here
2. I summon it and it wont work
3. ...