Manually created WitherSkull entities flash. They seem to be doing so without any player's actions. They don't flash simultaneously.
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is duplicated by 2
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this happens to me too, it flashes it for a split second and the color of it happens to be different the eyes are white for some reason, like the face bombs that the wither throws at you.can be removed by /kill @e.
Duplicate of MC-42192
I don't think that this is a duplicate of MC-42192 as it appears regular and not just in the tick while summoning.
Also I can confirm it for 14w34d.
How do you get it to last longer than several ticks (if not a duplicate of MC-42192)?
Confirmed for 1.8, they don't instantly despawn only if summoned with a direction tag.
Fixed for a future version per Searge:
I fixed an issue today that caused fireballs to flicker and non-moving wither skulls to become invisible. Map makers, switch to armor stands
Can confirm. See http://gfycat.com/FrenchFaroffBrahmanbull