Ender Dragon bugs

I went to The End, and the Ender Dragon wasn't there. I spawned it using /summon, but it had no health bar. Yes, I know it is similar to MC-82816, but it is NOT a dupe. MINE involves the health bar, which wasn't there. AND I said I spawned it with /summon. Even if I look at it, there is STILL no health bar.

Monkey832