Bug or Shading Error

Well, I have seen a bug that involves ALL the stairs in the game, except the ones with sticks, because when you want to try to break any ladder, you see a shading on it, I don't know if it is a bug ... or an error shadow ... but the issue is that I do not have any texture pack, I am with the default pack of the game and when you want to break a ladder of any type you see that shading ... and it is somewhat annoying visually