The new piston arm side texture (which appears in the piston side file) is currently unused, and the game uses the old texture instead (both textures can appear in-game due to this bug -> MCPE-38053).
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@Andrew Larson that's not what I meant. The texture is outdated, and I mentioned the other bug because it allowed for both textures to be together.
I was playing around it seems to only happen when the player is facing North and places a piston on the top side of a block so that the piston head faces south. Interestingly while the top side has what looks like a double head on one end the bottom side has a head on both the North and South side. When the piston is powered it functions as it should and the ghost piston heads persist.
Duplicate of https://bugs.mojang.com/browse/MCPE-38053