The only thing that I know of that was changed with disarming logic is that it now fails to teleport a weapon if it can't find a path to a tile in range, as might happen i.e. in the locked room beneath a broken floor room. It used to instead teleport the weapon to a random point of the level, but I pointed out that this could be used to lose the pickaxe in the mine as the result of a reclaimed trap spell. Evan had already prevented other ways to lose the pickaxe (i.e. dropping, transmuting) on that floor because you can't leave the floor without it in your inventory, so he opted to prevent this case from arising by reworking trap slightly.
Not sure if this is related to that or not though.