When I went to the end in survival mode the dragon nor the portal even spawned, commands when spawning in the dragon did nothing. It was only until i was using end crystals until the actual end portal appeared and put end crystals on that to "resummon" the dragon.  After that, the animation for respawning it went smoothly but as soon as the dragon spawned it was constantly flapping its wings at alarming rates, the end crystals were partialy still healing the dragon even when destroyed, and only relogging made the dragon actually come down to the portal once. Please Fix!