I don't know if it happened in earlier versions too.
I made a redstone circuit and placed a commandblock at the output side of a conductor which is next to a redstone wire (view first screenshot)
What I expected to happen was...:
As the commandblock should only receive redstone signals and output commands, the redstone wire should be left with the currency it had before
What actually happened was...:
Instead, the redstone wire got powered by the commandblock
Steps to Reproduce:
1. place a repeater or a conductor
2. place a commandblock at it's output spot
3. place redstone wire next to it
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Comments 3
Yup, intended and, actually, very useful. Often you need to power lots of com.blocks because they execute only one command, and placing them in pattern Block-Repeater-Block-Repeater allows you to create pretty compact contraptions
Did also happens in previous versions of Minecraft (often used to chain multiple commandblocks after each other).