Lighting does not update in quantities

I understand that world edit isn't exactly a part of vanilla Minecraft, but one thing I'd like to note is that when multiple blocks are placed at once that are expected to have light properties (glowstone, lamps, torches), they are lit-but do not produce light until individually placed on the ground. 

 

./setblock, however, does work. Perhaps the game can't accept multiple light sources at once?