Barriers behind each other display the 'None' particle and Z-fight with each other.
What I expected to happen was...
The barriers should not Z-fight or flicker
What actually happened was...
Constant flicker
Steps to reproduce:
1. Place 2 barrier blocks horizontally
2. Look at them so that one is behind the other
3. Observe flicker
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[media][media]

I don't believe this is a duplicate of MC-9553, unless that bug encompasses ALL display errors with barriers. This is simply z-fighting, the other one is wrong order of drawing (it does not flicker).