When you place a block that is technically 2 blocks (bed, door) the placing sound is only played once. I know this makes sense as only one "thing" is placed. But the official Mojang opinion seems to be that those blocks should be treated independent (MC-122263). When a 2 segmented block is broken the "break sound" is played twice so if the "place sound" is played only once this is definitly not "works as intended".