Right now, I am making a puzzle map that contains some redstone based puzzles. I came upon this bug, where if you place a redstone block one block above the piston, nothing happens. If you delete that piston and replace it the piston will activate, no matter it's orientation. The piston even activates if any updates are made to blocks touching it.

In the picture absolutely no redstone is connected to either pistons, they are in the exact same place, I have just placed a block beneath the piston. No changes but that.

I don't know if this is a bug or just a weird feature, but please help!