I have an issue with a specific texture, which is a jpeg black&white cow skin pattern.
Usually, when differentials become large, texture lookups return the smallest mipmap color, which is the average texture color.
With this specific texture, the corresponding lookups are black instead of grey. I have tried rendering a scene with the texture, it looks fine. If I multiply the uv differentials by some factor, the pattern becomes blurry as expected. If I further increase the factor, the result is black, whereas with other textures it converges to the average color.
I attached the corresponding texture. I'm using OIIO 2.1.10 and OSL 1.11.3
Did anyone have a similar issue?