When you place a redstone block and then a piston two blocks below it, the piston will be powered.
The piston can face in any direction.
If you place the piston before the redstone block, it won't be powered, and you'll need to refresh a nearby block to activate it.
If you use a regular block powered by a lever, for example, instead of the redstone block, that also works.
I discovered this by breaking the redstone as shown in the attached image (the piston on top doesn't change anything). Placing the redstone doesn't refresh it, but breaking it does.
This only works with pistons.
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Thank you for your report!
We're tracking this issue in MC-108, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you would like to learn more about this particular feature, see this article on the Minecraft Wiki.
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