Stair textures scaled incorrectly when placed in certain ways

Placing stairs next to each other at different directions makes the stairs “bend“. sometimes, when placed correctly, this can cause a small part of the stair to be scaled vertically correctly, but squished to half the pixel size horizontally.

In the demonstration below, only the back stair and left stair (the one with the glitch) matter. the back one was placed facing west, while the left one was placed facing north. (north is to the bottom right of the image)

the glitched part is the small corner of the left stair facing the player that has an odd texture.