The enderdragon is now respawning. So I tried to spawn the enderdraon with the 4 crystals and the enderdragon did not resepawn.. I even had other people test it out and it didn't work for them either..
MC-103791
Enderdragon Not Respawning
Resolved
Duplicate
0
Hunter Eggert
(Unassigned)
Unconfirmed
Minecraft 1.10
Retrieved
This issue duplicates MC-103497.