What happened: The Dragon was stuck flying around in it's dying state like nothing was wrong
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What I expected to happen was:
The dragon blows up and dies like normal
OR
Takes damage from explosion and get pushed far away from the large explosion.
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What actually happened:
I used /tp @e @p to TP all the TNT and the Dragon. Suddenly it dies from the explosion and got stuck in it's animation when it was "thrown" by the Explosions to then unload out of range.
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Steps to reproduce:
1)Summon (or Find) the Ender Dragon.
2)Get the Enderdragon to low enough health to die in a few TNT explosions.
3)Have something to push it away when the final hit is delivered, such as an explosion (or Explosions) with a strong force.
4) Have the Enderdragon die and get flung far enough away that it get's "stuck" in its death animation and unloads.
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Result:
The EnderDragon will be flying around stuck in the exact frame in his death animation with no health remaining. Simply punch it to resume it's death animation.
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NOTE
-I made a big box of TNT around the dragon when it was by the
-End Portal doing his attack breath. For some reason all the
-momentum is conserved during this attack and is release afterwards, -causing him to get "flung" far away.
NOTE2
--Same goes for when another dragon is trying to "hog" the portal from
--the first one, it causes all pushing momentum to fling the first one out of --the way. This is by far, the easiest method to do so, if the two dragons --are trying to hog the spotlight when the one that was there first dies it
--causes this to happen as well, but only if it was in the middle of the --attack when the killing blow was delivered.

Other Notes:
If the player moves and unloads the Dragon altogether, the visual look of the death animation vanishes but it will still die when hit by hand.
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