For those of you who don't play Minecraft, redstone (not to be confused with the Windows 10 update that has the code name "Redstone") is a special substance in the game's world that can transmit power. PC and Mac users also have another way to use redstone called quasi-connectivity, and it's actually a bug that, in Mojang's own words, has turned into a feature.
The Windows 10 and Pocket versions of Minecraft did not add this "feature" but Mojang decided to create an Observer block that basically does the same thing:
PC and Mac users will still have this redstone bug in place; Mojang does not intend to "fix" it.
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