this happened when trying to make a kitchen sink look in a realistic metal appearance. Applied the material, but then the mesh turned black with a slight matte-glossy appearance.
also I get an issue while trying to create a sidewall bumpiness for a car tire. Diffuse map is correctly placed, but when attaching a bump channel, it looks moved and stretched different than the original map. Also tried with manual rescaling inside enscape material editor and doesn't seem to fix.