Ghast keep theyr face when they are about to shoot a fireball even if they don't track the player anymore

In this bug report I want to mention a bug with ghasts in the nether!

 

BUG:

If the ghast is about to shoot a fireball and the player leaves it's tracking area then, for some weird reason, it keeps it's face when trying to shoot a fireball.

Steps to reproduce:

1. Go into the nether and find a ghast
2. Try to let the ghast see you
3. If the ghast is screaming and about to shoot a fireball, try to get out of the range it can see you
4. See the result of the bug mentioned

Expected Results:

The ghast should return to his normal "sad face".

Observed Results:

Ghast keeps it's face when screaming and trying shooting it's fireball.

Videos attached: YES

Bug Report Video

SKIP TO IN THE VIDEO: 9:49