Placing fence gates right beside a redstone source will not update them to the open state

When you place a door/trapdoor down into an already powered redstone current the door/trapdoor doesn't update automatically without manually updating it by placing a block next to the door/trapdoor. This bug doesn't occur with a piston (Also doesn't occur with powered rail, redstone lamp...) as when you place a piston down at the end of a redstone current thats powered the piston will immediately shoot its head up, however this doesn't happen with a door (Both wooden and Iron) and a trapdoor.

Steps on Re-creating:
1) Lay down a redstone torch
2) Place a door/trapdoor next to it
3) Nothing should happen so put a block next to the door/trapdoor

There you just had to manually update the door/trapdoor