Once ghasts go out of a certain range, they go invisible but do not lose sight of the player

What I expected to happen was...:
Ghasts should no longer have line of sight on the player nor should they be able to shoot fire balls at said player (only noticed this in multiplayer)

What actually happened was...:
Ghasts are still shooting fireballs outside of the visible mob distance

Steps to Reproduce:
1. Go to the nether (in multiplayer)
2. Confirm ghasts existence and have it gain line of sight on you
3. back away until the ghast is no longer visible, however it will still be able to shoot at you