The redstone dust will power blocks directly only if it's connected to something on the other side.
It create unexpected effects when powering transparent blocks, like pistons and fence gates.
The dust are rendered as it is powering both blocks but it powers only one.
To make the dust power both blocks it needs to connect to something, like another dust or a button.
Removing this bug removes the need of a extra dust, so it allows smaller contraptions.
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Working as intended. The redstone dust on the top block is connected like so.
Because the dust is connected, it wont power any blocks in that direction.
The dust from example is not powered, I will consider if you showed a image where the dust is powered.
Why working as intended if the dust is pointing to the fence? I know that it's named "direct powering", against to "indirect powering", where a block is powered by another block, powered by a dust.
Because it's not pointing to the fence that isn't being powered, it's connected along the vertical on the block. See attached screenshot, "Powered.png"
The linear dust power both blocks in this case. The only difference is because it's connected to another dust.
(Powered.png) is the same image from mine, with a dust less. (this image was posted by Neospector)
What's the difference? The dust is pointing in both images. It's on linear shape, on that power both sides.
Look "mnri9.png", where the dust, in the same shape, power two pistons. Turning just one lever on will have the same effect as both levers on.
Duplicate of MC-9405. Wow, that took a lot of searching. (No sarcasm intended)
I'm not impressed of that: the photos I uploaded are 8 months old.
I'm impressed that all this time passed and nothing was fixed.