Redstone dust seens to directly power block but it doesn't

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.