This is difficult to explain, but I have this image that is 15x16, but when I import in to unity it appears warped and blurry.
How it appears in-game:
I am familiar with this issue around pixel art, but the filter mode is set to point and the compression is turned off. The image is shown through an unlit URP shader, but I have tried other shaders and even a custom texture shader. Oddly enough, when the image is a perfect square such as 16x16, the issue completely disappears and the texture appears sharp as normal.