Texture of interior corner stair repeats texture

When placing an interior corner stair the extension to the next stair repeats the texture of the top section of the normally visible stair side instead of completing the block's side texture.

Steps to reproduce: (from PixelNinja)

1. Place 3 stairs in the shape of an L
2. Look at the back of the corner stair

Observed Results:
The stair has a misaligned texture which shows the front texture extruding through the front

Expected Results:
The back of the stair block should use the same texture as a full block without random join lines.