In a previous bug report ( https://feedback.vrchat.com/open-beta/p/sdk-381-beta4-toon-standard-has-flickering-nans-on-mobile ), I mentioned that the Toon Standard shader has issues with NaNs / intense areas of specular flickering around the edges of meshes when specular is enabled and reflectance is above 0. This issue has been resolved for materials that have gloss maps secified. Pi stated in the official Discord that this was achieved by multiplying the reflectance by the gloss map. However, if no gloss map is present, the flickering issue reveals itself once more. In the previous post, I shared a gif of a flower on the side of my avatar's head sparkling. As of the latest open beta using the latest build of the shader, it still does so as it has no gloss map specified. However, the rest of the avatar has no more sparkling. This had been an issue on the ears and is no longer a problem since that material does have a gloss map specified.