Redstone bug

I came across what I thought was a bug until I realized that the redstone was a dot and that the plus is used for now. But I found a bug where if you have a redstone torch on a block with a 2-block trail of dust next to it, then place a block with a redstone torch on the side facing the other torch, the torch will stay on even though there is a trail of redstone that is on and should be turning it off.