When an end crystal with a NBT tag of BeamTarget is created, the beam renderization is extremely glitchy, for example, if you look straight at the beam, you'll see it, yet, if you look at it slightly to the opposite way, it will stop rendering.
I tested this on multiple clients as seen in environment, and the result was the same.
I tested on a Realm, several SP worlds and a normal creative server.
Some screenshots below
( When i looked at yellow block i could see the beam, when i looked to red I couldnt.)
Ps: Couldn't attach the images so here is the imgur link: http://imgur.com/a/nDqBY
Environment
Client 1 -
Java 1.8.0_51 64 Bit on Windows 10 (64 bit)
Graphics: Fancy
Smooth Lighting: Maximum
3D Anaglyph: OFF
GUI Scale: Normal
Brightness: Bright
Particles: All
Use VSync: ON
Use VBOs: ON
Render Distance: 20 chunks
Max Framerate: 60 fps
View Bobbing: ON
Attack Indicator: Crosshair
Clouds: Fancy
Fullscreen: OFF
Mipmap Levels: 4
Entity Shadows: ON
Client 2 -
Java 1.8 64 Bits on Windows 8.1
Same video settings except for unlimited framerate
Client 3 -
Java 1.8 64 Bits on Arch Linux 64 bits
Same video settings except for fast graphics and 12 chunks render distance and unlimited framerate.
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However, this issue has been closed as a Duplicate of MC-91858.
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