The so worshiped 6-Sided Pistons no longer have their sacred texture This happens to both Sticky and Non-Sticky pistons. To be more precise, ids piston:6, piston:7, sticky_piston:6 and sticky_piston:7.
I've also been noticing that many blocks that use a high enough damage value are also missing their texture.(ex: a redstone block with datavalue of 2 or higher)