Placing normal torches and lanterns on a wall updates the shape accordingly; but the new soul torches and soul lanterns do not, and appear to hover on the wall.
Soul Fire Torches Do Not Connect to Walls When Placed on Top
The new Soulfire torch and Soulfire lantern are not connecting propperly with cobblestone walls
Soul Fire Torches and Lanterns don't change wall shape
Wall blocks do not change state consistently for partial blocks.
Stacked walls create pillars when they should not, depending on the order of placement
Walls don't create pillars with string / tripwire above