I spawned the ender dragon and it had no boss bar.
(The wither boss does have a health bar.)
Also arrows do not seem to be able to hit the dragon when it is on the Portal pedestal thing.
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The reason i used /summon was becasue the creeper face was not working does it need to face a specific direction and thank you.
I noticed that as well.
Spawning in the dragon using /summon will get you a dragon, but not everything else around the dragon fight. Use the proper ingame mechanics for resetting the fight, which currently is drawing a creeper face with clay blocks.