[2021.13610]Bezier Cyrcle not using Color-Attribute

Not 100% sure if this is intendet behaviour.
When creating a circleSOP and then setting the Cd-Member via ChopToSop, only a Polygon-Cricle will take the color-attribute. When Setting the circle to Bezier or NURBs nothing does happen.
When converting the Circle from Polygon to Bezier it takes the attribute without Problems, but not when Converting to NURBs.