Incorrect Dragon Fireball Damage

The ender dragons fireball attacks deals only 3 damage(1 1/2 hearts) rather than the usual 12(6 hearts)

Steps to Reproduced:
1. Make the portal to the end and enter it
2. Play on survival to be notice by the dragon.
3. Get closer to the bedrock nest for more likely to be shot by a fire ball.
4. Go to the dragons fireball particles

Observed Results:
Every second you'll receive a damage of 3 or 1 1/2 Hearts when you enter the dragons acid particles

Expected Results:
The dragons fireball damage is supposed to be 6 or 3 hearts per second, while if she's perching and shoots its end acid it deals 3 or 1 1/2 hearts. This means the fireball is likely to be a harming potion with a level of 2 dealing 6 damage per second while its dragons breathe attack deals 3 damage like a harming potion level 1.