I was working on a redstone plane when a piston was continuosly activated by the redstone block two blocks above it. I couldn't make the piston to compress even by removig redstone blocks on its "y" level. Please fix it early, this is very annoying.
Environment
When a piston is placed with a redstone block above it with one block empty. The block between them can be glass or air, I didn't test further.
Duplication of WAI: MC-108 It is called BUD, commonly used behaviour.