The EnderDragon during the fight will just straight up refuse to land and will fly in circles after all crystals are destroyed. Relogging causes the dragon to fully regenerate and teleport somewhere above the portal. After it lands once it will go back to refusing to land. I'm actually completely stuck in the end because of this because the dragon will also refuse to land after it is dead, not allowing the fight to end.
Comments 4
Relates to MC-148179
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For the dragon not landing bug, see MC-194339.
Confirmed - I came to the end and destroyed all the crystals then the dragon kept flying in circles about 20 meters wide which made the fight ridiculously easy. If this is not fixed 1.14.1 is just around the corner