Piston "inner" texture files contain pixels that cannot normally be seen

Relates to: MC-176095 MC-199660 MC-208679 MC-250985

May also relate to: MC-159560

The bug

The innermost 4×4 square of pixels in the texture file blocks/piston_inner.png is never possible to see outside of exceptional circumstances such as Spectator mode and debug stick usage. As such, it can be effectively regarded as an unused region of pixels, since in practice it will always be obscured by the piston arm. Deleting these pixels from the texture file (like is done for most other texture files) would make it clearer that these pixels cannot normally be seen.

How to fix

An easy fix - just replace the vanilla piston inner texture file with the one attached, and replace Programmer Art's with the fixed Programmer Art texture as well.