Put the summary of the bug you're having here

What I expected to happen was...:
that the ender eyes would guide me to a stronghold and that the ender dragon would appeared again after the 4 ender crystals on the middle of each side of the end portal
What actually happened was...:
The ender eyes led me to a place without any stronghold and the dragon didn't ressumon
Steps to Reproduce:
1. Try to ressumon the ender dragon in the certain way
2. Wait and wait and wait. Ps: my map is old (around 1.7)
3. ...