Ender dragons going to XYZ 0 0 0 when spawned in any type of world

Me and my friend were playing Minecraft on the new snapshot and summoned the enderdragon but it was flying away from us so we followed it and it went straight to X 0 Y 0 Z 0 - We tried it in a new world and it did the same thing

Update: Ender dragon will still go to 0 0 0, but will move away shortly thereafter, only to go back to 0 0 0 later on, or just 0 ~ 0 (~ = any Y coordinate)

Moderator note:
The fix of that ticket freezes any sumoned Dragon. If you want your summoned Dragon to fly , use

/summon EnderDragon ~ ~ ~ {DragonPhase:0}

REPLY TO MODERATOR NOTE
That's not a fix. Please change this to unresolved because it isn't resolved. Before this update ended dragons were fine, I don't know why they can't be normal by default