Why are not the Minecraft pistons retracting?

Ka
4

I built a glass door with glass blocks and sticky pistons in Minecraft. However, these do not drive after interruption of the Redstone signal partially, until you destroy a block nearby. Does somebody has any idea? I also came across the tip that I may not use "Vanilla Premium". What does that mean?

Ca

You have to put a Diablock next to the Piston. Then the pistons work.

Ka

Diamond?

Ka

Did I do (right next to it), but still not…

Could it have something to do with me pumping the pistons from above?

Ka

I just rip it off and build a Jeb door instead, which strangely always goes…