RED does not correctly render textures with dimension(s) less than 16

[GooberRF]

Example texture (64 x 8 pixels):

RED:

In-game:

RED doesn't properly render textures with either dimension less than 16 properly, though those textures render without issue in the game. This is a minor issue that only affects mappers (and even then, only in rare cases). Very low priority, but I wanted to document it as a bug.