I am using Unity verson 2022.1.1f1 with URP. None of my meshes, prefabs or materials show thumbnails. I have tried to refresh and reimport them with no success. I can edit a value in a material and the thumbnail will show until I save my project again, then it will return to being blank. I am getting an error that seems to occur somewhat randomly. Sometimes at runtime, sometimes when I save. Any help would be appreciated, thanks!