Ender crystal beam does not appear when the ender dragon is out of view

What I expected to happen was to be able to see the Ender Crystal beam that hits the Ender Dragon when looking at the Ender Crystal and not having the Dragon in view.

What actually happened was that the beam did not appear.

Steps to Reproduce:
1. Stand on top of an obsidian tower facing the Ender Crystal.
2. Make sure that the Ender Dragon is facing the back of your player
(It happens in all gamemodes and if the Ender Dragon has {NoAI:1b} or {NoAI:0b}