I don't know what is the exact reason, either the pulling animation ends too late or the game changes the piston data too early however the result is that the animation of the retracting piston head causes z-fighting with the piston.
I don't know what is the exact reason, either the pulling animation ends too late or the game changes the piston data too early however the result is that the animation of the retracting piston head causes z-fighting with the piston.
Confirmed
animation, piston, piston_head, z-fighting
Minecraft 1.8.7, Minecraft 1.8.8, Minecraft 15w44b, Minecraft 15w50a, Minecraft 15w51b, Minecraft 16w35a
Minecraft 1.10.2
Retrieved
Fixed in either 15w38a or 15w38b. Not confirmed for 15w44b.