The Temple Stairs block incorrectly adapts to having another stair block placed perpendicular to it when both blocks are upside-down. This can cause a graphical rendering glitch where the texture of any block adjacent to what should be the 'back' of the corner stair is incorrectly rendered, allowing players to see through the world.

See the following images for examples of this:

This is a pattern of five stair blocks, with the one in the corner facing the same way as the left stairs. The corner block transforms as if the right stairs are facing the opposite direction, and because there is a block adjacent to it, it creates the glitch described above.


This is a U-shape of stairs, with the bottom three all facing the same direction. As you can see, the stairs at the corners transform as if the top stairs are facing the opposite way.


This is a similar arrangement as the previous one, with the orientation of all the stairs reversed. A similar error occurs, with the corner stairs turning the wrong way.


Speaking as someone with a very basic understanding of Java, it seems as though half of the method is working correctly in that it
prevents rendering in the correct places. The section that renders the texture for a corner stair appears to be the issue. I would suggest that this is a simple fix, as the code renders the 'left-facing' texture when it should render the 'right-facing' texture and vice versa. This suggests to me that swapping the action taken to render a 'left-facing' texture and 'right-facing' texture should fix the problem.